Add documentation to run unit tests

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

README.md

@@ -53,7 +53,7 @@ create isolated Python environment is recommended for this project.
 
 2. Set up ML Conversational Analytic Tool in a virtualenv
    ```python
-   python3 -m venv virtualenv-ml-conversational
+   python -m venv virtualenv-ml-conversational
    ```
 
 3. Activate the virtualenv
@@ -70,6 +70,17 @@ create isolated Python environment is recommended for this project.
    ```python
    pip install -r requirements.txt
    ```
+#### Testing
+6. Run all unit tests
+   ```python
+   cd ml-conversational-analytic-tool
+   python -m unittest discover -s tests
+   ```
+7. Run an individual unit test
+   ```python
+   cd ml-conversational-analytic-tool
+   python -m unittest tests/<file_name>
+   ```
 
 The libraries used within the project are available in the [requirements.txt](./requirements.txt).
 
@@ -160,7 +171,6 @@ 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!
-
 ## Documentation
 
 Auto-generated API documentation can be found in