feat: default method to GET if not provided (#9)

Set the default request method to `GET` if no method is provided

Reviewed-on: https://codeberg.org/vlw/curl/pulls/9

curl.sh

@@ -1,8 +1,8 @@
 #!/bin/bash
 
 # Check if the correct number of arguments is provided
-if [ "$#" -ne 2 ]; then
-    echo "Usage: $0 <url> <request_method>"
+if [ "$#" -ne 1 ]; then
+    echo "Usage: $0 <url> [request_method]"
     exit 1
 fi
 
@@ -17,7 +17,7 @@ RESP_BODY_RAW_FILE="curl/resp_body.txt"
 RESP_BODY_JSON_FILE="curl/resp_body.json"
 
 url="$1"
-method="$2"
+method="${2:-GET}"
 
 # Append url search parameters
 if [ -f $REQ_PARAMS_FILE ]; then