Add-app-manifest.md

+Create a manifest.yml file in the root of your rails app and commit it along with the rest of your code. If you have the `awesim_rails` gem included, you can do that by running a rake task:
+
+```sh
+$ rake awesim:manifest
+manifest.yml created in root of rails app
+$ 
+```
+
+Here is an example:
+
+```yaml
+name: Fill Sim
+description: |
+  FillSim is an interactive and easy to use web app that models complex fluid
+  dynamics in a user-supplied container.
+documentation: |
+  [Documentation](https://www.osc.edu/some/link/to/documentation.html)
+```
+
+* name: The title of the app
+* description: a multi-line markdown formatted string
+* documentation: a multi-line markdown formatted string
+
+YAML lets you create multiline string values for a key using the pipe. Everything on the next line and after thats indented the same number of spaces together is used as the value.
+
+This means you can have bullet lists and links and bold and underline etc. This manifest information is what is displayed in the dashboard at https://apps.awesim.org/devapps
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