Add API readme

htdocs/api/readme.md

@@ -0,0 +1,50 @@
+API howto
+=========
+
+Explore the api
+---------------
+
+You can explore API method by using web interface : https://**yourdolibarr.tld**/htdocs/public/api/explorer/index.html (replace **yourdolibarr.tld** by real hostname of your Dolibarr installation)
+
+Access to the API
+---------------
+
+> **Warning : access to the API should (or better : must!) be secured with SSL connection**
+
+To access to the API you need a token to identify. When you access the API for the first time, you need to log in with user name and password to get a token. **Only**  this token will allow to access API with.
+
+To log in with the API, use this uri : https://**yourdolibarr.tld**/htdocs/public/api/login?login=**username**&password=**password** (replace bold strings with real values)
+
+The token will be saved by Dolibarr for next user accesses to the API and it **must** be put into request uri as **api_key** parameter. 
+
+Develop the API
+--------------
+
+The API uses Lucarast Restler framework. Please check documentation https://www.luracast.com/products/restler and examples http://help.luracast.com/restler/examples/ 
+Github contains also usefull informations : https://github.com/Luracast/Restler
+
+To implement it into Dolibarr, we need to create a specific class for object we want to use. A skeleton file is available into /dev directory : *skeleton_api_class.class.php* 
+The API class file must be put into object class directory, with specific file name. By example, API class file for '*myobject*' must be put as : /htdocs/*myobject*/class/api_*myobject*.class.php. Class must be named  **MyobjectApi**.
+
+If a module provide several object, use a different name for '*myobject*' and put the file into the same directory. 
+
+**Define url for methods**
+
+It is possible to specify url for API methods by simply use the PHPDoc tag **@url**. See examples :
+
+    /**
+    * List contacts
+    * 
+    * Get a list of contacts
+    *
+    * @url	GET /contact/list
+    * @url	GET /contact/list/{socid}
+    * @url	GET	/thirdparty/{socid}/contacts
+    * [...]
+
+**Other Annotations**
+Other annotations are used, you are encouraged to read them : https://github.com/Luracast/Restler/blob/master/ANNOTATIONS.md
+
+PHPDoc tags can also be used to specify variables informations for API. Again, rtfm : https://github.com/Luracast/Restler/blob/master/PARAM.md 
+
+