[doc] added note for development buildout

doc/install.rst

@@ -108,6 +108,11 @@ Installation Steps
    $ conda activate beatedit
    $ buildout
 
+#. Note for development mode: Add the line ``dependent-scripts = true`` then use the ``buildout`` command to ensure to generate all the executables in the ``bin/``
+   folder even ``beat`` for ``beat.editor``: ::
+
+   $ buildout
+
 #. In ``bin/`` you should several new executables for the project. The Python setup part is done.
 
 #. Go into the root folder for the Javascript and install the dependencies via NPM: ::