docs: adding steps to run e2e tests locally (#822)

Added steps on how to run e2e tests locally

Author: harshilgajera-crest

README.rst

@@ -141,6 +141,22 @@ Run pytest with the add-on and SA-eventgen installed and enabled in docker
 
 For full usage instructions, please visit the `pytest-splunk-addon documentation pages over at readthedocs`_.
 
+Run e2e tests locally
+---------------------
+
+* For e2e tests we are using a functionality of pytest which creates a temp dir and copies all the required file to that dir and then runs the pytest cmd from the tests.
+* e2e tests can be found under /tests/e2e
+
+Note: Must install docker desktop.
+
+.. code:: bash
+
+    $ git clone --recurse-submodules -j8 git@github.com:splunk/pytest-splunk-addon.git
+    $ cd pytest-splunk-addon
+    $ poetry install
+    $ poetry run pytest -v --splunk-version=${splunk-version} -m docker -m ${test-marker} tests/e2e
+
+
 Contributing
 ------------
 Contributions are very welcome. Tests can be run with `pytest`_, please ensure