Added README.md in Assets/HoloToolkit-UnitTests

Author: aalmada

Assets/HoloToolkit-UnitTests/README.md

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+# HoloToolkit-UnitTests
+This folder will host unit tests that test individual HoloToolkit-Unity components.
+
+#### Creating a unit test:
+
+1. Unit tests can be located anywhere under an Editor folder but consider placing it under the HoloToolkit-UnitTests\Editor folder so that HoloToolkit-Unity can be easily deployed without the tests if required.
+2. Use the **NUnit 2.6.4** features to create the tests.
+3. Cover us much as possible the new code so that other people can test your code even without knowing its internals.
+4. Execute all the tests before submitting a pull request.
+
+#### Running the unit tests:
+
+1. Unit tests execution is integrated into the Unity editor (since 5.3). 
+2. Open the **Editor Tests** window by clicking on the menu item **Window** | **Editor Tests Runner**.
+3. Click on the buttons **Run All**, **Run Selected** or **Run Failed** to run the tests. 
+