Add documentation to DoSomething project (purpose isn't CPP unit tests)

Author: ianfixes

SampleProjects/DoSomething/test/README.md

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+# Purpose
+
+These files are designed to test the Ruby gem itself, such that its basic tasks of library installation and compilation can be verified.  (i.e., use minimal C++ files -- feature tests for C++ unittest/arduino code belong in `../TestSomething/test/`).
+
+## Naming convention
+
+Files in this directory are expected to have names that either contains "bad" if it is expected to fail or "good" if it is expected to pass.  This provides a signal to `rspec` for how the code is expected to perform.