WIP: Document class properties and methods.

DeProjMetrics.md

+# DeProj metrics.
+
+We give here the list of metrics returned by DeProj and their definition.
+
+## The core classes: `deproj` and `epicell`.
+
+The DeProj toolbox revolves around two MATLAB classes:
+
+- The `epicell`class is used to store the data for one cell in a tissue. It is made of several fields we describe below:
+
+```matlab
+o = 
+
+  epicell with properties:
+
+                 boundary: [26×3 single]
+                   center: [2.4705 11.1826 3.1008]
+             junction_ids: [5×1 double]
+                     area: 8.0176
+                perimeter: 12.5227
+             euler_angles: [-2.0734 0.4195 -0.2500]
+               curvatures: [0.0110 -4.8103e-05 0.0240 -0.0020]
+              ellipse_fit: [2.2284 11.1114 3.1008 2.3848 1.1178 0.4528]
+             eccentricity: 0.8834
+           proj_direction: 1.2539
+         uncorrected_area: 7.3173
+    uncorrected_perimeter: 12.1116
+                       id: 4
+```
+
+
+
+- The `deproj` class manages a collection of `epicell`s, and represent for instance the results of the analysis of a whole image.
+
+```matlab
+dpr = 
+
+  deproj with properties:
+
+          epicells: [426×1 epicell]
+    junction_graph: [1×1 graph]
+             units: 'µm'
+```
+
+## The `epicell` class properties.
+
+### `boundary`
+
+The `boundary` property stores a 3D polygon that delimits the cell. It is represented as a `N x 3` matrix, with points sorted 
+
+## The `deproj` class properties.
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