README.md: Add details on how the tests are run

Information on working of sit-test-cases and the steps to manually run the
individual tests of sit-test-cases are missing.
Adding this data helps new contributers to quickly dive into development.

So added details and quick steps to start with individual tests.

Fixes: #19
Signed-off-by: Shwetha K Acharya <Shwetha.K.Acharya@ibm.com>

README.md

@@ -1,4 +1,61 @@
 # Samba integration tests
 
-This branch contains the actual tests for the cluster nodes and are run on the client machines.
+This repo contains tests for Samba when used with Clustered or other Software-Defined Storage systems.
 
+[sit-environment](https://github.com/samba-in-kubernetes/sit-environment) creates an environment on which these tests can be run using vagrant by setting up
+virtual machines with the desired backend storage, ctdb and samba.
+Ansible playbooks in sit-environment run the tests in [sit-test-cases](https://github.com/samba-in-kubernetes/sit-test-cases) on the client machines created by sit-environment.
+
+
+
+## Steps to manually run the individual tests in sit-environment on a local machine:
+
+PRE-REQUISITES:
+- [sit-environment](https://github.com/samba-in-kubernetes/sit-environment) should be locally intalled.
+- After installation, sit-environment should be setup using [setup guide](https://github.com/samba-in-kubernetes/sit-environment/blob/main/docs/Fedora-Setup.md)
+
+
+STEPS TO RUN INDIVIDUAL SIT TEST CASES:
+- check the vagrant status to know the status of machines created by the sit-environment
+  ```
+      # pwd
+        /home/<user>/sit-environment
+      # cd vagrant
+      # vagrant status
+        Current machine states:
+
+        setup0                    running (libvirt)
+        client0                   running (libvirt)
+        storage0                  running (libvirt)
+        storage1                  running (libvirt)
+  ```
+
+- Log in to client0 in order to manually run the tests on the client
+  ```
+      # vagrant ssh client0
+  ```
+- Change to root user
+  ```
+      # sudo -i
+  ```
+- Enter samba-integration-tests
+  ```
+      # cd samba-integration-tests
+  ```
+
+- Export essential PATH variables inorder to access pytest and test-info.yml:
+  ```
+      # PYTHONPATH=.
+      # TEST_INFO_FILE=test-info.yml
+      # PATH=$PATH:/usr/local/bin
+      # export PYTHONPATH TEST_INFO_FILE PATH
+  ```
+
+- Run the required test cases manually using pytest
+  ```
+      # pytest -v test/case/path
+  ```
+  Example:
+  ```
+      # pytest -v testcases/smbtorture/test_smbtorture.py
+  ```