add client server compatibility info in doc (#94)

Author: cbellot000

docs/source/getting_started/index.rst

@@ -27,7 +27,7 @@ Installation
 
 
 Tryout Installation
-~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~
 
 For a quick tryout installation, use:
 
@@ -92,9 +92,9 @@ Optional Dependencies
 
 Optional package dependencies can be installed for specific usage:
 
-- - `Matplotlib <https://pypi.org/project/matplotlib/>`_ for chart plotting
-- - `PyVista <https://pypi.org/project/pyvista/>`_ for 3D plotting
-- - `Scooby <https://pypi.org/project/scooby//>`_ for dependency reports
+- `Matplotlib <https://pypi.org/project/matplotlib/>`_ for chart plotting
+- `PyVista <https://pypi.org/project/pyvista/>`_ for 3D plotting
+- `Scooby <https://pypi.org/project/scooby//>`_ for dependency reports
 
 
 Compatibility
@@ -105,3 +105,31 @@ more information, see `Ansys Platform Support <https://www.ansys.com/solutions/s
 Other platforms may be supported by using DPF within a
 containerization ecosystem such as Docker or Kubernetes. 
 For more information, see :ref:`docker`.
+
+***************************
+Client Server Compatibility
+***************************
+
+The `ansys.grpc.dpf <https://pypi.org/project/ansys-grpc-dpf/>`_ module should be synchronized 
+with the server version as shown here:
+
+.. list-table:: Client-Server Compatibility
+   :widths: 35 35 35
+   :header-rows: 1
+
+   * - Ans.Dpf.Grpc.exe server version
+     - ansys.grpc.dpf python module version
+     - ansys.dpf.core python module version
+   * - 2.0 (Ansys 2021R2)
+     - 0.3.0
+     - >=0.3.0
+   * - 1.0 (Ansys 2021R1)
+     - 0.2.2
+     - 0.2.*
+
+
+Future development will try to ensure backward compatibilty from the client to the server.
+
+
+To start a server with Ans.Dpf.Grpc.bat or Ans.Dpf.Grpc.sh (used in the `start_local_server`  function),
+please make sure that the environment variable `AWP_ROOT{VER}` with (VER=212, 221, ...) is set.