Create full documentation.

[stepanzubkov]

I prefer docs in markdown format, so I want to use it for cc-api docs.

• Rewrite README
• • Add information about license
• • Add contribution mini-guide
• • Rewrite deploy guide
• • Add logo (optional)
• • Add information about clients (cc-cli, cc-web)
• Add API docs in docs/ folder
• • Describe all url/ methods
• • Describe all paste/ methods
• • Add examples (curl + maybe python)
• • Describe Url and Paste models.
• • Mini-guide for contributors, that describes code structure and code style

All docs should be initially written in English and later translated to Russian. Maybe other languages, if I find translators.