Merge pull request #3189 from ellert:gtest-help-test-GNU/kFreeBSD

PiperOrigin-RevId: 349349288

googlemock/g3doc/includes/g3_BUILD_rule.md

@@ -0,0 +1,17 @@
+## BUILD Rule
+
+Add *one* of the following to your `deps`:
+
+```build
+"//testing/base/public:gunit",
+"//testing/base/public:gtest_main",
+```
+
+Add this to your `.cc` file:
+
+```cpp
+#include "gmock/gmock.h"
+```
+
+Unless noted, *all functions and classes* are defined in the `::testing`
+namespace.