docs(compiler): reorganize the doc

docs/dev/setup/layout.md

@@ -1,4 +1,6 @@
-# Concrete projects layout
+# Projects layout
+
+## Concrete layout
 
 Concrete is a modular framework composed by sub-projects using different technologies, all having theirs own build system and test suite. Each sub-project have is own README that explain how to setup the developer environment, how to build it and how to run tests commands.
 
@@ -10,3 +12,17 @@ Concrete is made of 4 main categories of sub-project that are organized in subdi
     - `concrete-cpu`, using TFHE-rs that implement the fastest implementation of TFHE on CPU.
     - `concrete-cuda` that provides a GPU acceleration of TFHE primitives.
 - `tools` are basically every other sub-projects that cannot be classified in the three previous categories and which are used as a common support by the others.
+
+## Concrete Python layout
+
+The module structure of **Concrete Python**. You are encouraged to check individual `.py` files to learn more.
+
+* concrete
+  * fhe
+    * **dtypes:** data type specifications (e.g., int4, uint5, float32)
+    * **values:** value specifications (i.e., data type + shape + encryption status)
+    * **representation:** representation of computation (e.g., computation graphs, nodes)
+    * **tracing:** tracing of python functions
+    * **extensions:** custom functionality (see [Extensions](../../tutorial/extensions.md))
+    * **mlir:** computation graph to mlir conversion
+    * **compilation:** configuration, compiler, artifacts, circuit, client/server, and anything else related to compilation