added a readme

README.md

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+# 🦀 drand-client-rs
+
+A simple drand client implementation written in rust
+
+## Roadmap
+- [x] http transport
+- [x] json parser
+- [x] chained scheme
+- [ ] unchained scheme
+- [ ] unchained scheme with G1 and G2 swapped
+- [ ] protobuf parser
+- [ ] libp2p transport
+- [ ] nicer error messages
+- [ ] comprehensive testing
+- [ ] rustdoc
+- [ ] github actions for testing
+- [ ] examples