Update README.

README.md

 sot-romeo
-=========
+===========
+
+This packages provides a generic Stack Of Tasks library
+for the humanoid robot Romeo.
+
+Install
+-----
+
+To compile this package, it is recommended to create a separate build
+directory:
+
+    mkdir _build
+    cd _build
+    cmake [OPTIONS] ..
+    make install
+
+Please note that CMake produces a `CMakeCache.txt` file which should
+be deleted to reconfigure a package from scratch.
 
-This packages provides a generic Stack Of Tasks library for the humanoid robot Romeo.
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