Create CONTRIBUTING.md

CONTRIBUTING.md

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+Thanks for sumbitting or fixing an icon! Here is a helpful guide to what you need to include.
+
+- [ ] New file
+- [ ] Edit Readme
+- [ ] Edit radius page
+- [ ] Add reference image
+- [ ] Edit refernce page
+- [ ] (optional) Android Image
+
+## New File
+
+Filename should be `nameofservice.svg` - all in lower-case.
+
+Place the file in `/images/svg/`
+
+At a minimum, your icon needs these components:
+
+```
+<svg
+xmlns="http://www.w3.org/2000/svg"
+aria-label="..." role="img"
+viewBox="0 0 512 512">
+<rect
+width="512" height="512"
+rx="15%"
+fill="#fff"/>
+...
+</svg>
+```
+
+Please keep the whitespace as-is. This makes viewing diffs easier.
+
+## Edit Readme
+
+Add a table cell to README.md - it must be in this format:
+
+```
+<td><img src="images/svg/nameofservice.svg" width="125" title="Name Of Service" /><br>229 Bytes</td>
+```
+
+## Edit Radius Page
+
+* Edit the file `radius.html`
+* Add the name of your service to `var items`
+* For example `, 'nameofservice', `
+
+## Reference Image
+
+* Find an *official* logo.
+* Add it to `/images/reference/`
+
+## Reference Page
+
+* Edit the file `/images/reference/index.md`
+* Add a link to the *official* style guide or brand guidelines.
+* For example `| <img src="/images/svg/nameofservice.svg" width="256" />	| <img src="/images/reference/nameofservice.jpg" width="256" />	| https://example.com/press |`
+
+## (Optional) Create Android Version
+
+* Use https://inloop.github.io/svg2android/ to create an Android-compatible XML file.
+* Add the file to `/images/android-vector-drawable/`