[tutorial 002] A first variable (config and doc)

README.md

@@ -6,6 +6,7 @@ include_toc: true
 
 
 - [[tutorial 001] An empty file](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_001/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_001~1..v1.1_001))
+- [[tutorial 002] A first variable](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_002/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_002~1..v1.1_002))
 
 
 # Description
@@ -13,7 +14,16 @@ include_toc: true
 
 <img src="firefox.png" width=50% height=50% alt="Firefox Proxy setting"/>
 
-An empty file
+A first variable
+
+In the Firefox configuration, it is possible to define several configuration modes,
+from no proxy at all ("No proxy") to a kind of automatic configuration mode from a file 
+("Automatic proxy configuration URL").
+
+We’re gonna create a first variable called "proxy_mode":
+
+- accepts only a string as value
+- requires a value (that is, None is not an option)
 
 # Structure
 
@@ -23,7 +33,6 @@ An empty file
 
 ```yml
 ---
-version: 1.1
 
 ```
 ## Generated documentation