Update readme

README.md

@@ -1,9 +1,20 @@
 [![Build Status](https://travis-ci.org/Yitsushi/cpp-commander.svg?branch=master)](https://travis-ci.org/Yitsushi/cpp-commander)
-
 [![Coverage Status](https://coveralls.io/repos/github/Yitsushi/cpp-commander/badge.svg?branch=master)](https://coveralls.io/github/Yitsushi/cpp-commander?branch=master)
 
 # Testing
 
 ```
 $ cmake . && cmake --build . && ctest
 ```
+
+If you want an awesome coverage report, you have to enable it while calling `cmake`.
+
+```
+$ cmake -DCMAKE_BUILD_TYPE=Debug -DWITHCOVERAGE=1 . && \
+    cmake --build . && \
+    make coverage
+```
+
+# Example
+
+Check `examples` directory.