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 +1,53 @@
 # Samba integration tests
 
-This branch contains the actual tests for the cluster nodes and are run on the client machines.
+The tests are part of the Samba Integrated testing project
+[sit-environment](https://github.com/samba-in-kubernetes/sit-environment)
+and are primarily used to test Samba servers exporting a clustered
+filesystem such as cephfs, glusterfs and others.
 
+### Prerequisite:
+The tests are designed to run against any SMB server. The only
+prerequisite is that we have a SMB server exporting a filesystem which
+can be accessed over the network.
+Refer:
+[server_setup](https://wiki.samba.org/index.php/Setting_up_Samba_as_a_Standalone_Server)
+[filesytem_export_with_glusterfs](https://wiki.samba.org/index.php/Samba_CTDB_GlusterFS_Cluster_HowTo)
+
+### Quick guide on running the test-cases:
+- Install sit-test-cases
+  ```
+      $ git clone https://github.com/samba-in-kubernetes/sit-test-cases.git
+  ```
+
+- Rename test-info.yml.example file under sit-test-cases to test-info.yml
+  ```
+      $ cd sit-test-cases
+      $ mv test-info.example test-info.yml
+  ```
+
+- Update the relevant information in test-info.yml such as private and
+  public interfaces, exported share names and test users and passwords from the
+  previously set up samba server.
+
+- Run make sanity_test to confirm the sanity of the setup before running the tests
+  (Can be used whenever new set of changes are introduced in sit-test-cases):
+  ```
+      $ make sanity_test
+  ```
+
+- Run full test suite using make test:
+  ```
+      $ make test
+  ```
+
+- Run individual test cases(can be used for debugging):
+  ```
+      $ pwd
+      $ /path/to/repo/sit-test-cases
+
+      $ PYTHONPATH=`pwd` TESTINFO_FILE=test-info.yml pytest -v testcases/smbtorture
+  ```
+
+NOTE:
+- Some tests are performed against a share mounted using the cifs kernel module.
+  This particular action requires root access.