Create a README

README.md

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+# PHP client for the Debian Transmission RPC API
+
+## Purpose
+
+I wrote this client because of a lack of features with other PHP clients. This implementation is full, tested
+with PHPUnit and as close as possible from the original RPC interface.
+
+## Installation
+
+With composer:
+
+```sh
+composer require 'martial/transmission-api:~1.0"
+```
+
+## Usage
+
+### Instantiation
+
+```php
+// Load composer autoloader
+
+$httpClient = new GuzzleHttp\Client(['base' => 'http://transmission-server:9091/transmission/rpc']);
+$api = new \Martial\Transmission\API\RpcClient($httpClient, 'rpc-username', 'rpc-password');
+```
+
+### Session ID
+
+You must provide a session ID as first parameter of all API methods. This ID can be retrieved by calling any of
+these methods with an invalid session ID, and by catching the \Martial\Transmission\API\CSRFException:
+
+```php
+$sessionId = '';
+
+try {
+    $api->sessionGet($sessionId);
+} catch (\Martial\Transmission\API\CSRFException $e) {
+    // The session has been reinitialized. Fetch the new session ID with the method getSessionId().
+    $sessionId = $e->getSessionId();
+} catch (\Martial\Transmission\API\TransmissionException $e) {
+    // The API returned an error, retrieve the reason with the method getResult().
+    die('API error: ' . $e->getResult());
+}
+```
+
+### Method usage example
+
+Then, just read the documentation of the interface \Martial\Transmission\API\TransmissionAPI. Each method is documented:
+
+```php
+try {
+    $api->torrentAdd($sessionId, [
+        \Martial\Transmission\API\Argument\Torrent\Add::FILENAME => '/path/to/the/torrent/file.torrent'
+    ]);
+} catch (\Martial\Transmission\API\DuplicateTorrentException $e) {
+    // This torrent is already in your download queue.
+} catch (\Martial\Transmission\API\MissingArgumentException $e) {
+    // Some required arguments are missing.
+} catch (\Martial\Transmission\API\CSRFException $e) {
+    // The session has been reinitialized. Fetch the new session ID with the method getSessionId().
+} catch (\Martial\Transmission\API\TransmissionException $e) {
+    // The API returned an error, retrieve the reason with the method getResult().
+    die('API error: ' . $e->getResult());
+}
+```