Update supported_plugins.rst

Author: coder137

docs/source/user_api/supported_plugins.rst

@@ -3,3 +3,19 @@ Supported Plugins
 
 clang_compile_commands.h
 ------------------------
+
+.. doxygenclass:: buildcc::plugin::ClangCompileCommands
+
+Example
+--------
+
+.. code-block:: cpp
+    :linenos:
+
+    using namespace buildcc;
+
+    Target foolib;
+    Target hello_world;
+
+    // Foolib and Hello world targets are both added to a single "compile_commands.json" file
+    plugin::ClangCompileCommands({&foolib, &hello_world}).Generate();