add doc on how to contribute bouncers (#560)

* add doc on how to contribute bouncers

* fix typo

docs/contributing.md

@@ -74,3 +74,67 @@ ucVcwqjIXn/9V6+pFZ11soXNKuTk4Wx+uO2r/i5bVA==
 =Edl+
 -----END PGP PUBLIC KEY BLOCK-----
 ```
+
+
+## Publishing bouncers
+
+We do welcome bouncers from the community, and will gladly publish them on the hub.
+
+### Why ?
+
+Sharing your bouncer on the hub allows other users to find it and use it. While increasing your code's visibility, it ensures as well a benevolent look from the community and the team over it.
+
+### How ?
+
+To have your bouncer published on the hub, please simply [open a new issue on the hub](https://github.com/crowdsecurity/hub/issues/new), requesting "bouncer inclusion". The bouncer will then be reviewed by the team, and then will be published directly on the hub, for everyone to find & use it !
+
+
+The information that should be stated in your issue are :
+
+ - The source repository of your bouncer (for example `https://github.com/crowdsecurity/cs-firewall-bouncer/`)
+ - The software licence used
+ - The current status of the bouncer (stage : dev/unstable/stable)
+ - Documentation (can be simply in the README.md) :
+    - must contains : installing, uninstalling
+    - should contains : configuration documentation 
+ - Link to existing tests if applicable (functional tests or unit tests)
+
+Please take care of the following :
+
+ - Ensure your repository has a About/Short description meaningful enough : it will be displayed in the hub
+ - Ensure your repository has a decent README.md file : it will be displayed in the hub
+ - Ensure your repository has *at least* one release : this is what users will be looking for
+ - (ideally) Have a "social preview image" on your repository : this will be displayed in the hub when available
+ - (ideally) A Howto or link to guide that provides a hands-on experience with the bouncer
+
+
+Please find below a template :
+
+```markdown
+Hello,
+
+I would like to suggest the addition of the `XXXX` to the hub :
+
+ - Source repository: https://github.com/xxx/xxx/
+ - Licence : MIT
+ - Current status : stable (has been used in production for a while)
+ - README/doc : https://github.com/xxx/xxx/blob/main/README.md
+ - Existing tests :
+    - functional tests : https://github.com/xxx/xxx/blob/main/.github/workflows/tests.yml
+
+ - Short/Long description : OK
+ - Howto : in README
+ - At least one release : yes
+
+```
+
+## Publishing parsers, scenarios and collections
+
+### Why ?
+
+Sharing your parsers, scenarios and collections on the hub allows other users to find it and use it. While increasing your code's visibility, it ensures as well a benevolent look from the community and the team over it.
+
+### How ?
+
+To have your parser/scenario published on the hub, please simply [open a new issue on the hub](https://github.com/crowdsecurity/hub/issues/new), requesting "parser/scenario inclusion". The configurations will then be reviewed by the team, and then will be published directly on the hub, for everyone to find & use it !
+