README.md in openstudio-calibration-0.4.0 vs README.md in openstudio-calibration-0.5.0

@@ -18,12 +18,23 @@
 
 Or install it yourself as:
 
     $ gem install 'openstudio-calibration'
 
-## Usage
+# Compatibility Matrix
 
-To be filled out later.
+|OpenStudio Calibration Gem|OpenStudio|Ruby|
+|:--------------:|:----------:|:--------:|
+| 0.5.0  | 3.3      | 2.7    |
+| 0.4.0 - 0.4.2  | 3.2      | 2.7    |
+| 0.3.0 - 0.3.1  | 3.1      | 2.5    |
+| 0.2.0   | 3.0      | 2.5    |
+| 0.1.4 and below | 2.9 and below      | 2.2.4    |
+
+# Contributing 
+
+Please review the [OpenStudio Contribution Policy](https://openstudio.net/openstudio-contribution-policy) if you would like to contribute code to this gem.
+
 
 # Releasing
 
 * Update CHANGELOG.md
 * Run `rake rubocop:auto_correct`