rename doc file

doc/update.rst

@@ -0,0 +1,24 @@
+
+
+Bootstrapping a new project
+===========================
+
+Download the ``update.py`` and execute it to fetch other infrastructure files
+which will be needed to build the project::
+
+  mkdir cmake  # does not have to be called "cmake" - take the name you prefer
+  cd cmake
+  wget https://github.com/scisoft/autocmake/raw/master/update.py
+  python update.py --self
+
+This creates (or updates) the following files (an existing ``autocmake.cfg`` is
+not overwritten by the script)::
+
+  cmake/
+      update.py   # no need to edit
+      autocmake.cfg  # edit this file
+      lib/
+          config.py  # no need to edit
+          docopt.py  # no need to edit
+
+Note that all other listed files are overwritten (use version control!).