docs: add initial testing.md outline

Add a new piece of documentation, intended to be a tutorial on running,
writing, and reviewing unit tests for the CI suite. Outline the sections
to be written in some detail (subject to change).

There are a handful of methods for running the CI, foremost by using
Docker or by building the OpenBMC SDK. This tutorial will cover the
Docker method, as it is most similar to what the Jenkins bot does, and
most consistent across platforms.

Tested: Viewed markdown file in Chrome.

Change-Id: Ic98c02bc8f4dc6eaf4e7d1432422cdd934862548
diff --git a/docs/testing.md b/docs/testing.md
new file mode 100644
index 0000000..6f7bce4
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@@ -0,0 +1,23 @@
+# Running Tests
+
+## Setting Up Your Environment
+
+## Building
+
+## Running
+
+## Reading Output
+
+# Writing Tests
+
+## Setting Up Your Environment
+
+## Best Practices
+
+## Sending for Review
+
+# Reviewing Tests
+
+## Best Practices
+
+## Quickly Running At Home