Merge branch 'doc/introduction' into 'master'

adds information on listing cmake options

See merge request !111

README.rst

@@ -264,13 +264,24 @@ equal to :code:`<TURTLE_DIR>`.
 
 
 5.
-    Finally, we are ready to install TurTLE. Within the build folder, execute
+    TurTLE may now be compiled and installed.
+    Within the build folder, execute
 
     .. code:: bash
 
         source bash_setup_for_TurTLE.sh
         cmake .. -DCMAKE_INSTALL_PREFIX=<TURTLE_DIR>
 
+    Default compilation options will typically be inadequate for
+    specific users, it is recommended to adapt them as needed.
+    To this end you may use `ccmake`, or at a minimum append the desired
+    options to the `cmake` call given above.
+    To list the options, you may use
+
+    .. code:: bash
+
+        cmake .. -LH
+
     Then compile TurTLE with :code:`<N>` cores using
 
     .. code:: bash