message: Add build badge for color tool master.
diff: @@ -8,3 +8,8 @@ Here you'll find assorted console tools in the `tools/` directory, such as the
  We will be monitoring and responding to issues as best we can.
  Please attempt to avoid filing duplicates of open or closed items when possible.
  +
  +## Build Status
  +
  +|---|---|
  +|tools/ColorTool|![](https://microsoft.visualstudio.com/_apis/public/build/definitions/c93e867a-8815-43c1-92c4-e7dd5404f1e1/17023/badge)|
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