DOC New contributing guide documentation For scikit-learn-extra (#47)

* DOCS New Documentation For scikit-learn-extra

* Updated Docs

* remove unnnecessary doc info

* Removed lines 2-5 and 15-16

Co-authored-by: = <==>

Author: danmurphy1217

doc/docs.md

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+# Scikit-learn-extra Developer Documentation
+## Installation Instructions:
+### scikit-learn-extra Requires:
+- Python (>= 3.5)
+- scikit-learn(>=0.21)
+- Cython (>0.28)
+### User Installation:
+You can install scikit-learn-extra using this command: 
+`pip install https://github.com/scikit-learn-contrib/scikit-learn-extra/archive/master.zip`
+