Add documentation to run unit tests

update the README.md with the commands to run unit tests

README.md

@@ -24,10 +24,11 @@ inclusive pull requests to foster a healthier open source community.
         - [Extract Raw Data from GitHub](#extract-raw-data-from-github)
         - [Annotate](#annotate)
     3. [Train models](#train-models)
-4. [Documentation](#documentation)
-5. [Blog Posts](#blog-posts)
-6. [Contributing](#contributing)
-7. [License](#license)
+4. [Running tests](#running-tests)
+5. [Documentation](#documentation)
+6. [Blog Posts](#blog-posts)
+7. [Contributing](#contributing)
+8. [License](#license)
 
 ## Build and Run
 
@@ -148,6 +149,21 @@ Both `BaseCNN` and `BaseLSTM` also have prediction explanation mechanisms that c
 If you have ideas on how to improve the framework to assess text conversation for constructive and inclusive
 communication, we welcome your contributions!
 
+## Running tests
+### Run tests with a virtual environment
+```python
+python3 -m venv virtualenv-ml-conversational
+``` 
+### Running all the test unit tests
+```python
+cd ml-conversational-analytic-tool
+python -m unittest discover -s tests
+```
+### Running individual unit tests
+```python
+cd ml-conversational-analytic-tool
+python -m unittest tests/<file_name>
+```
 ## Documentation
 
 Auto-generated API documentation can be found in