Add help for fatal error on Windows when executing pip install. .

docs/source/installation.rst

@@ -24,3 +24,32 @@ Now activate the venv
     source venv/bin/activate
 
 The virtual environment now runs with python 3.10 and plotID can be installed the usual way as described in :doc:`Overview`.
+
+
+Installation on Windows via pip
+-------------------------------
+If you're trying
+
+.. code:: cmd
+
+    pip install .
+
+and following error is thrown
+
+.. code:: cmd
+
+    Fatal error in launcher: Unable to create process using '"...env\Scripts\python.exe"  "..\venv\Scripts\pip.exe" install .': The system cannot find the specified file.
+
+Try to forcefully reinstall pip
+
+.. code:: cmd
+
+    python -m pip install --upgrade --force pip
+
+Or use 
+
+.. code:: cmd
+
+    python -m pip install .
+
+instead.