docs: add env examples, CONTRIBUTING/CODE_OF_CONDUCT, MIT License; align README and sample.env [GSSoC 2025] #41
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Adds .env.example for server/client
Aligns server/client sample.env with README and actual code
Updates README (clone URL, commands, env var names, ports, links to guides)
Adds CONTRIBUTING.md and CODE_OF_CONDUCT.md
Adds MIT LICENSE
Closes #6 , Closes #10 , Closes #19 , Closes #34