chore(doc): Add module doc

FofbTool/__init__.py

+"""
+FofbTool is a module to operate and configure the Fast Orbit Feedback (FOFB) platform at SOLEIL.
+
+This package is cut in several modules:
+    * FofbTool.Utils
+        Contains usefull functions, or first level function that make use of the core functions.
+
+    * FofbTool.Operation
+        Contains core functions to make actions on the (FOFB) platform.
+
+    * FofbTool.Configuration
+        Contains core functions to apply configurations on the FOFB platform
+
+For basic usage, see doc of FofbTool.Utils
+
+"""
 __version__ = "2.2"