Add directories to contain themes for ecommerce and edx-platform

.gitignore

+.idea/
+
+edx-platform/**/cms/**/css/
+edx-platform/**/lms/**/css/

README.md

-Sample edX Themes
-==========
-
-This is a sample repository for edx themes.

README.rst

+Sample Themes for OpenEdx
+=========================
+This repository contains sample themes for LMS (Learning Management System), Studio and the E-Commerce service.
+
+A more detailed description of how you apply themes to Studio, the LMS and the E-Commerce service and guidelines for theming templates, assets and styles can be found here_.
+
+.. _here: http://edx.readthedocs.io/projects/edx-installing-configuring-and-running/en/open-release-eucalyptus.master/configuration/changing_appearance/theming/index.html

ecommerce/README.rst

+Sample Themes for E-Commerce Service
+====================================
+This directory contains themes for E-Commerce Service,
+following directory structure should be followed for each theme.
+
+
+.. code-block:: text
+
+   themes
+      |
+      └─ my-theme
+          ├── README.rst
+          ├── static
+          |      └── images
+          |      |     └── logo.png
+          |      |
+          |      └── sass
+          |            └── partials
+          |                   └── utilities
+          |                           └── _variables.scss
+          |
+          └── templates
+                └── oscar
+                |     └── dashboard
+                |             └── index.html
+                └── 404.html
+
+A more detailed description of how you apply themes to the E-Commerce service and guidelines for theming templates, assets and styles can be found here_.
+
+.. _here: https://github.com/edx/ecommerce/blob/master/docs/theming.rst

edx-platform/README.rst

+Sample Themes for LMS and Studio
+================================
+This directory contains themes for LMS (Learning Management System) and Studio,
+following directory structure should be followed for each theme.
+
+
+.. code-block:: text
+
+   themes
+      |
+      └─ my-theme
+           ├── README.rst
+           ├─── lms
+           |     ├── static
+           |     |      └── images
+           |     |      |     └── logo.png
+           |     |      |
+           |     |      └── sass
+           |     |            └── partials
+           |     |                   └── base
+           |     |                        └── _variables.scss
+           |     |
+           |     └── templates
+           |             └── footer.html
+           |             └── header.html
+           └── cms
+                ├── static
+                |      └── images
+                |      |     └── studio-logo.png
+                |      |
+                |      └── sass
+                |            └── partials
+                |                   └── _variables.scss
+                |
+                └── templates
+                        └── login.html
+
+
+A more detailed description of how you apply themes to Studio, the LMS and the E-Commerce service and guidelines for theming templates, assets and styles can be found here_.
+
+.. _here: http://edx.readthedocs.io/projects/edx-installing-configuring-and-running/en/open-release-eucalyptus.master/configuration/changing_appearance/theming/index.html