feat: Adding an initial version of contributing.md.

CONTRIBUTING.md

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+## Basic guidelines for everycase.
+
+To contribute you will need an account in https://gitea.sergiotarxz.freemyip.com
+do not worry, it is really easy to get one, you do not need to give your real
+email address.
+
+Once you did that you should make a Fork of this project in your account and
+then clone that fork.
+
+This link should give you to a forking interface of this project: https://gitea.sergiotarxz.freemyip.com/repo/fork/15
+
+Then you checkout to a new branch like this:
+
+```shell
+git checkout -b feature/adding_more_sugar_to_the_project
+```
+
+or
+
+```shell
+git checkout -b bugfix/removing_salt_added_while_trying_to_add_sugar
+```
+
+You are ready to start changing things, when you want to push a commited change then you should do something like this.
+
+```shell
+git push -u origin HEAD
+```
+
+Then do a pull request on the original project and wait for review.
+
+## Contributing a new theme.
+
+When creating a new theme you should create a new folder under themes with the name of your theme with a folder named public and dist inside. 
+
+```shell
+mkdir -pv themes/sugartheme/public/dist
+```
+
+Dist is where the files that compose your theme must end.
+
+Your theme public folder must be a valid node project with a `package.json` and a script named `build`.
+
+The current theme of the project is specified in `peertube-dl-web.conf` so for test your new theme you should edit that file, avoid git tracks that file change if the theme is not intended to become default.
+
+While running `cpanm .` the Makefile of the project will run `yarn build` inside your theme so there is no need you do that, only do not push autogenerated files.
+
+As rule of thumb is better to create a new theme that to change drastically one on interface, but is not a definitive rule.
+
+## Autogenerated files.
+
+If a autogenerated file reach master that is considered a bug, review will try to avoid that situation, but you should try your git client do not track that file, is generally more safe to manually `git add` every file you want to be tracked, altough if you do not edit `peertube-dl-web.conf` `git add -u` can also do the trick.