fix: add instructions to create a must-gather image

Adding instructions to create a must-gather image.

Signed-off-by: Mudit Agarwal <[email protected]>

must-gather/README.md

@@ -1,12 +1,12 @@
-OCS must-gather
+LVM must-gather
 =================
 
 `lvm-must-gather` is a tool built on top of [OpenShift must-gather](https://github.com/openshift/must-gather)
 that expands its capabilities to gather LVM Operator information.
 
 ### Usage
 ```sh
-oc adm must-gather --image=quay.io/ocs-dev/lvm-must-gather
+oc adm must-gather --image=quay.io/ocs-dev/lvm-must-gather:latest
 ```
 
 The command above will create a local directory with a dump of the lvm state.
@@ -31,6 +31,11 @@ Developers must follow these steps to make a change:
 7. Work with the community to make any necessary changes through the code
    review process (effectively repeating steps 3-7 as needed).
 
+To test the changes in must-gather follow these steps:
+1. Run `make lvm-must-gather`
+2. It will create an image named `quay.io/ocs-dev/lvm-must-gather:latest`
+3. Tag it and push it to your image repository to use it with the `oc adm` command
+
 #### Commit and Pull Request Messages
 
 - Follow the standards mentioned in [LVM-Operator How to Contribute](./../CONTRIBUTING.md)