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README.md

@@ -5,7 +5,29 @@ Social Networks data analysis utilities and tools, starting with Twitter.
 To install, first install [ExoRepo](https://code.tupale.co/Offray/ExoRepo) and then from a _playground_ in [GToolkit](https://gtoolkit.com/) execute:
 
 ```smalltalk
-    ExoRepo new
-      repository: 'https://code.tupale.co/Offray/Datanalitica';
-      load.
-```
+  ExoRepo new
+    repository: 'https://code.tupale.co/Offray/Datanalitica';
+    load.
+```
+
+## Minimal usage example
+
+**Prerequisite**: You will need to have already your [Twitter API Keys](https://developer.twitter.com/en/support/twitter-api).
+
+Load your API keys into a `TwitterAPI` object:
+
+```smalltalk
+  twitterAPI := TwitterAPI new
+    apiKeysFile: FileLocator home / 'Route/To/myAPIKeysFile.json';
+    loadKeys.
+```
+ 
+ (If you don't define a particular route to your API keys file, it will be loaded from a default location
+ in : `~/.config/Datanalitica/twitter-api-keys.json`)
+
+ Once you have loaded your keys, you can run your first query using the DSL (Domain Specific Lanuage):
+
+```smalltalk
+  twitterAPI usersGroupMentioning: 'feenkcom'
+```
+