Add monitor web page to Health Check test

Also add documentation.

Change-Id: I4732a65d21a458711672f6f49d56d186b15bd8c8
Issue-ID: NONRTRIC-200
Signed-off-by: elinuxhenrik <henrik.b.andersson@est.tech>
diff --git a/docs/use-cases.rst b/docs/use-cases.rst
new file mode 100644
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+++ b/docs/use-cases.rst
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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright (C) 2020 Nordix
+
+Use Cases
+=========
+
+To support the use cases defined for the Non-RT RIC, there are implementations provided in the nonrtric repo, see:
+  nonrtric/test/usecases
+
+Health Check
+------------
+The Health Check use case for the Non-RT RIC is a python script that regularly creates, reads, updates, and deletes a
+policy in all Near-RT RICs that support the type used by the script. A self refreshing web page provides a view of
+statistics for these regular checks.
+
+For more information about it, see the README file in the use case's folder.
+
+.. image:: ./images/healtcheck.png