feat(doc): update README

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# Reflect API client for PHP
Make requests to an API built using the [Reflect API](https://github.com/VictorWesterlund/reflect) framework over HTTP or UNIX sockets. This program comes with both an extendable/instantiable class that you can integrate with existing PHP code, or as a stand-alone CLI which can be run by itself or UNIX piped into other programs.
Make requests from a PHP application to an API built with the [Reflect API framework](https://github.com/VictorWesterlund/reflect).
---
Make a request with `Client->call()`. It will always return the response as an array of length 2.
- The first value is the HTTP-equivalent response code.
- The second value is the response body
```php
$client = new Reflect\Client("<API URL or path to UNIX socket>", "<API key (optional)>");
$client->call("foo", Reflect\Method::GET); // (array) [200, "bar"]
$client->call("foo", Reflect\Method::POST, [
"foo" => "bar"
]); // (array) [201, "Created"]
// etc..
```
## How to use
Requires PHP 8.1 or newer, and of course a Reflect API endpoint.
## Installation
1. **Install with composer**
```
composer require reflect/client
```
2. **Initialize the class**
2. **`use` in your PHP code**
```php
use Reflect\Client;
$client = new Client(string $api_base_url, ?string $api_key, ?bool $verify_peer = true);
```
## Making API calls
Start by initializing the `Client` with a base URL to the API, and with an optional API key.
```php
require_once "/vendor/autoload.php";
use Reflect\Client;
use Reflect\Method;
$client = new Reflect\Client("<API URL or path to UNIX socket>", "<API key (optional)>");
$client = new Client("https://api.example.com", "MyApiKey");
```
3. **Make API request**
### Defining an endpoint
Use the `call()` method to perform a request
Start a new API call by chaining the `call()` method and passing it an endpoint string
```php
$client->call("foo?bar=baz", Reflect\Method::GET);
Client->call(string $endpoint): self
```
Argument index|Type|Required|Description
--|--|--|--
0|String|Yes|Fully qualified pathname and query params of the endpoint to call
1|Method\|string|Yes|A supported [Reflect HTTP method](https://github.com/VictorWesterlund/reflect/wiki/Supported-technologies#http-request-methods) (eg. `Method::GET`) or a string represnetation of a supported method (eg. "GET")
2|Array|No|An optional indexed, associative, or multidimensional array that will be sent as the request body as `Content-Type: application/json`
Example:
The `call()` function will return an array of length 2 wil the following information
Index|Type|Description
--|--|--
0|Int|HTTP-equivalent response code (eg. `200` or `404`)
1|String/Array|Contains the response body as either a string, or array if the response `Content-Type` header is `application/json`
## How to use (CLI)
You can also run this from the command line with
```
php client <socket_file> <endpoint> <http_method> [payload]
```php
$client->call("my/endpoint");
```
and it will return a serialized JSON array with the same structure as described in the `Client->call()` return.
### (Optional) Search Parameters
*Example*
```sh
php client "/run/reflect.sock" "foo?bar=biz" "POST" "[\"foo\" => \"bar\"]" # (string) [201, \"Created\"]
Pass an associative array of keys and values to `params()`, and chain it anywhere before a `get()`, `patch()`, `put()`, `post()`, or `delete()` request to set search (`$_GET`) parameters for the current request.
```php
Client->params(?array $params = null): self
```
---
Example:
Requires PHP CLI 8.1 or greater, and of course a Reflect API endpoint.
1. **Clone repo**
```
git clone https://github.com/victorwesterlund/reflect-client-php
```php
// https://api.example.com/my/endpoint?key1=value1&key2=value2
$client->call("my/endpoint")
->params([
"key1" => "value1",
"key2" => "value2"
]);
```
2. **Run from command line**
### `GET` Request
Make a `GET` request by chaining `get()` at the end of a method chain. This method will return a `Reflect\Response` object.
```php
Client->get(): Reflect\Response;
```
// From the root directory of this project
php client <url_or_socket_file_path> <endpoint> <http_method> [payload]
Example:
```php
$client->call("my/endpoint")->params(["foo" => "bar"])->get();
```
### `POST` Request
Make a `POST` request by chaining `post()` at the end of a method chain. This method will return a `Reflect\Response` object.
Pass `post()` a stringifiable associative array of key, value pairs to be sent as an `application/json`-encoded request body to the endpoint.
```php
Client->post(array $payload): Reflect\Response;
```
Example:
```php
$client->call("my/endpoint")->params(["foo" => "bar"])->post(["baz" => "qux"]);
```
### `PATCH` Request
Make a `PATCH` request by chaining `patch()` at the end of a method chain. This method will return a `Reflect\Response` object.
Pass `patch()` a stringifiable associative array of key, value pairs to be sent as an `application/json`-encoded request body to the endpoint.
```php
Client->patch(array $payload): Reflect\Response;
```
Example:
```php
$client->call("my/endpoint")->params(["foo" => "bar"])->patch(["baz" => "qux"]);
```
### `PUT` Request
Make a `PUT` request by chaining `put()` at the end of a method chain. This method will return a `Reflect\Response` object.
Pass `put()` a stringifiable associative array of key, value pairs to be sent as an `application/json`-encoded request body to the endpoint.
```php
Client->put(array $payload): Reflect\Response;
```
Example:
```php
$client->call("my/endpoint")->params(["foo" => "bar"])->put(["baz" => "qux"]);
```
### `DELETE` Request
Make a `DELETE` request by chaining `delete()` at the end of a method chain. This method will return a `Reflect\Response` object.
Pass `delete()` an optional stringifiable associative array of key, value pairs to be sent as an `application/json`-encoded request body to the endpoint.
```php
Client->delete(?array $payload = null): Reflect\Response;
```
Example:
```php
$client->call("my/endpoint")->params(["foo" => "bar"])->delete();
```