make the repo open-source friendly

[ZibanPirate]

By:

• [x] Explaining why this project exists?
• [x] explaining different ways of contributing to kuliya
  • Language specific contributions
  • Data contribution ( fill up your university/school info )
  • Suggestions ( improve/fix/change things on the repo )
  • By actually using one of kuliya's packages in your project and giving us feedbacks
• [x] Issue and PR templates and labels and milestones
• [x] Badges on the readme
• [x] code of conduct, contribution guideline
• [x] note that you better sync your fork if it's outdated
• [x] define October milestone
  • [x] issues for each language
  • [x] issues for each university
• [ ] coverage badge
• [ ] how-to add univ/instu/shcool in _data folder