Add license

The license has been derived from https://www.blender.org/about/logo/ as discussed in https://github.com/webpack/meeting-notes/pull/15/files

Closes #1

LICENSE

@@ -0,0 +1,11 @@
+The logo and the brand name “webpack” are not part of the MIT license, and can only be used commercially by the webpack project on products, websites, and publications.
+
+Under the following conditions, third parties may use the webpack logo as well:
+
+- The logo can only be used to point to the product webpack. When used with a link on a web page, it should point to the URL https://webpack.js.org/.
+- You will visualize and promote your own branding more prominent than you use the webpack logo. The webpack logo only can be used as a secondary brand, which means it has to be clear for an average viewer that this is not an official webpack website, publication or product.
+- You can use the webpack logo on promotion products, such as T-shirts or caps or trade show booths, provided it is a secondary brand as described in point 2.
+- The logo is used unaltered, without fancy enhancements, in original colors, original typography, and always complete (logo + text webpack).
+- In case you use the logo on products you sell commercially, you always have to contact us with a picture of how it will be used, and ask for explicit permission.
+
+If you have further questions or doubts, do not hesitate to contact us. You can create an issue at https://github.com/webpack/media or write an email to mail@johannesewald.de

README.md

@@ -44,4 +44,4 @@ When only small pictures are allowed (like favicons), you can choose the smaller
 
 ## License
 
-We still need to choose a proper license for this (see [#1](https://github.com/webpack/media/issues/1)). Until then, it is not permitted to use anything here outside the webpack project.
+The logo and the brand name are **not MIT licensed**. Please check [our LICENSE](https://github.com/webpack/media/blob/master/LICENSE) for usage guidelines.