Add running tests to CONTRIBUTING

Author: Abdur-rahmaanJ

CONTRIBUTING.md

@@ -57,6 +57,32 @@ Changes should always include tests. If this is a bug fix it is a good idea to a
 first commit of the pull request and the changes to fix the issue in subsequent commits to make it
 easier to validate it.
 
+### Running tests before submitting pull request
+
+To run local tests, first install the test requirements:
+
+```shell
+python3 -m pip install -e . -r requirements-test.txt
+```
+
+Then, run the check:
+
+```shell
+make check 
+```
+
+To run check for only Python, run:
+
+```shell
+make check-python
+```
+
+To run check for only JS, run:
+
+```shell
+make check-js
+```
+
 ## Pull requests
 
 ### Linting your code