Add instructions to add a new workshop.

README.rst

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+Website of BCCP Workshops
+=========================
+
+This is the hosting repository for BCCP workshops. The idea is borrowed from Scipy-Conferences. 
+
+Here, each workshop is set up as a branch. To start a new workshop, branch off from an existing workshop:
+
+1. Select the base workshop from the branches menu of the github interface
+
+2. Type a new branch name, in a format like `2017-non-linear-universe`. Github will ask you if you are to create a new branch. Select yes.
+
+3. Now we are on the `2017-non-linear-universe` (or any branch name you decided). Edit the website to make sure information is accurate. (Sponser, Venue, Links to Schedule, Organizers, etc).
+
+4. Edit this file [subsites]_ to add an entry for the website. The format of a line is
+
+.. code ::
+
+ Branch-name  |  URL on the bccp website | html | .
+
+
+For example,
+
+.. code ::
+
+ 2017-non-linear-universe | 2017-non-linear-universe | html | .
+
+
+
+The last two words must be `html` and `.` -- those will be useful for future updates.
+After the file is edited and committed, you shall soon be able to find the website online.
+For our example, the url is `http://bccp.berkeley.edu/2017-non-linear-universe`.
+
+5. Remember to add a link to the website to the workshops page of the bccp website.
+
+
+.. [subsites] https://github.com/bccp/website/blob/master/subsites.txt
+
+
+
+