Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to `piku`
+
+`piku` is a stable project, but we welcome contributions that:
+
+* Help us move beyond Python 3.8+ (which is the current target due to Linux LTS distribution alignment)
+* Help us do better automated testing
+* Improve documentation (some docs are a bit old by now) 
+* Help us deploy `piku` in various Linux distributions and environments (check the sister repositories in the project)
+* Provide sample deployments of common applications (again, check the sister repositories in the project)
+* Allow us to better support more language runtimes
+* Allow us to support different web servers or process supervisors (Caddy springs to mind as a popular alternative for small VPSes)
+
+## Code Size / Style
+
+By its very nature, `piku` is a very small program. By today's standards of all-encompassing solutions this may seem strange, 
+but it would benefit from being kept that way.
+
+So please keep that in mind when contributing.
+
+For instance, if your runtime or framework needs additional setup, it might be better to contribute an utility script to run 
+in a `release` entry in the `Procfile` rather than patching `piku.py` -- but do hack at it if that is the best way to achieve it.