Adding README

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-# http-chained-requests-automator
+# HTTP Chained Requests Automator
+This PHP script automates and chains HTTP requests, extracting values from headers or body and use them for the next requests. Very useful for penetration tests.
+
+It has been ispired by a business-logic challenge of Port Swigger:
+
+https://portswigger.net/web-security/logic-flaws/examples/lab-logic-flaws-infinite-money
+
+## Usage
+
+```bash
+$ php hcra.php params.json DEBUG
+```
+
+- params.json: is the filename of the JSON file with specifications of the HTTP requests
+- DEBUG: use only for debug purpose. It additionally prints out the body response of every HTTP request
+
+## Configuration
+
+To configure HTTP request you have to code your custom JSON file. You can start from the example in the repository:
+
+```json
+[
+    {
+        "url": "http://localhost/mysite/login",
+        "method": "POST",
+        "headers": null,
+        "body": "username=admin&password=s3cr3t",
+        "header-regexp": [
+            {
+                "next_url": "/Location: (.+?)$/"
+            },
+            {
+                "cookie": "/Set-Cookie: (.+?)$/"
+            }
+        ],
+        "body-regexp": null
+    },
+    {
+        "url": "http://localhost§next_url§",
+        "method": "GET",
+        "headers": {
+            "Cookie": "§cookie§"
+        },
+        "body": null,
+        "header-regexp": null,
+        "body-regexp": [
+            {
+                "email": "/<p>Your email is: (.+?)<\\/p>/"
+            }
+        ]
+    },
+    {
+        "url": "http://localhost/mysite/sign-up",
+        "method": "POST",
+        "headers": {
+            "Cookie": "§cookie§"
+        },
+        "body": "op=signup&email=§email§",
+        "header-regexp": null,
+        "body-regexp": null
+    }
+]
+```
+
+Every JSON object is an HTTP request with specific parameters:
+- **url**: the URL to request
+- **method**: GET|POST (you could also use PUT, DELETE, etc, but not yet tested!)
+- **headers**: a JSON array with all headers you want to send with the request
+- **body**: the body of the request in case you send a POST request
+- **header-regexp**: an array of regular expressions you want to use to extract values from the headers. IMPORTANT: only the first value per regexp will be matched
+- **body-regexp**: like header-regexp, but the values will be matched against the response body
+
+Example:
+
+```php
+"next_url": "/Location: (.+?)$/"
+```
+
+This will match the redirection after the first request, for example:
+```http
+Location: /mysite/welcome
+```
+
+If match happens, you can use
+```php
+§next_url§
+```
+
+as a variable on the next requests, so the 2nd url will change from:
+```json
+"url": "http://localhost§next_url§",
+```
+to:
+```json
+"url": "http://localhost/mysite/welcome",
+```
+
+until you match another **next_url** values with another regular expression with the next requests.
+
+## TODO
+ - better error managing
+ - add some logics, so for example the script can restart from a specific request after getting some specific results from the variables