DOCSP-41642: Add in the in-depth installation instructions (#114)

Author: mayaraman19

source/get-started/download-and-install.txt

@@ -4,6 +4,13 @@
 Download and Install
 ====================
 
+.. note:: Alternative Installation Methods
+
+   The following guide shows you how to install {+driver-short+} by using
+   `pip <https://pip.pypa.io/en/stable/installation/>`__. To install 
+   {+driver-short+} from source, see `Install from Source <https://pymongo.readthedocs.io/en/stable/installation.html#installing-from-source>`__
+   in the API Documentation.
+
 .. procedure::
    :style: connected