doc(monorepo): add road map

Monorepo_Roadmap.md

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+# Monorepo Roadmap 
+
+## PR packages improvement
+ * Add feature Geodesy package
+   * **Place/orienting/scaling a object3D in geographic system in real time**, replace part of code by this new feature, in these classes :
+      - FeatureProcessing
+      - Feature
+      - TileMesh/Tiled
+      - examples
+
+* **Widgets**
+	- Make public and publish 
+
+* **Debug**
+	- rewrite debug
+
+## iTowns Core package with private sub-packages 
+ * Data and styling
+  	* **New Class** : `Quadree spatialization`
+		- Make standalone `FeatureGeometryLayer`
+		- Replace the code in `TiledGeometryLayer`
+ 	* Loaders : Sources and Parsers
+	* Style
+ * Make generic processing classes (remove `TiledLayer` dependency)
+	* `Fetcher, Scheduler, Mainloop` 
+ * THREE Tools
+	* Three Extended and rendering Methods
+    * Converters : Data to THREE.js
+
+## 2 Standalone public packages (usable directly with THREE.js)
+
+ * **Terrain**
+ 	* TiledGeometryLayer -> devrait servir pour 3D WFS
+ 	* GlobeLayer and PlanarLayer
+ 	* Elevations and Color Layers
+
+ * **3D Layers** (it could be split in subpackages)
+ 	* FeatureGeometryLayer
+ 	* 3d Tiles
+ 	* Points
+ 	* Projection Layer
+
+ ## Viewing and interactiviting
+
+ 	* Picking
+ 	* handling the multi projection convertion
+ 	* Camera/Viewer
+ 	* Controls
+
+## To remove 
+
+* Providers
+