adds "contributing" section in readme

README.md

@@ -1,3 +1,13 @@
 # law.photography content
 
-This repository is the content for [law.photography](https://law.photography) which is a collection of international photo related law. Note that these files don't contain offical legal advice, but is an easy to read collection with references to the respective law texts.
+This repository is the content for [law.photography](https://law.photography) which is a collection of international photo related law. Note that these files don't contain offical legal advice, but is an easy to read collection with references to the respective law texts.
+
+## Contributing
+
+1. To add to pages or fix mistakes, just navigate to the right page and hit the **Edit** button.
+2. If you want to add pages, please clone the repository and follow the pattern in `laws`. Add the uppercased country (example: `Denmark`) and then the file name like `street.md` or `drones.md`
+3. If you want to translate a page, please use the two letter ISO code at just before the file name extention like `street.de.md`.
+
+If that doesn't make sense, just send us an email or a file, we'll put it up! :)
+
+For more info check out [law.photography/contributing](https://law.photography/contributing/)