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CONTRIBUTING.md

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+# Contributor's Guide
+
+1. fork the project on GitHub https://github.com/vyos/vyos-documentation
+2. clone the fork
+3. create a a new branch for your work. You can use a name that describes what you do.
+    ```shell
+    git checkout -b fix-vxlan-typo
+    ```
+4. make your changes.
+
+   Please check the documation, if you don't familiar with [sphinx-doc](http://http://www.sphinx-doc.org) or [reStructuredText](http://www.sphinx-doc.org/en/master/usage/restructuredtext/index.html)
+
+   Note the following RFCs, which describe the reserved public IP addresses and autonomous system numbers for the documentation. Please don't use other public address space.
+
+   * [RFC5737](https://tools.ietf.org/html/rfc5737)
+   * [RFC3849](https://tools.ietf.org/html/rfc3849)
+   * [RFC5389](https://tools.ietf.org/html/rfc5398)
+
+
+
+5. add the modified files
+    ```shell
+    git add path/to/filname
+    ```
+    or add all unstaged files
+    ```shell
+    git add .
+    ````
+6. commit your changes
+    ```shell
+    git commit -m "rename vxlan set syntax"
+    ```
+7. push your commits to your GitHub project:
+
+    ```shell
+    git push -u origin fix-vxlan-typo
+    ```
+8.  Submit a pull request.
+
+    In GitHub, visit the main repository and you should see a banner
+    suggesting to make a pull request. Fill out the form and describe what you do.