Update README.md

added sections Documentation/Philosophy/Features/Roadmap

README.md

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-A Redis client for Rust inspired by [StackExchange.Redis](https://github.com/StackExchange/StackExchange.Redis)
-& [redis-async-rs](https://github.com/benashford/redis-async-rs)
+An asynchronous Redis client for Rust.
+
+## Documentation
+[Official Documentation](https://docs.rs/redis-driver/latest/redis_driver/)
+
+## Philosophy
+* Low allocations
+* Full async library
+* Rust idiomatic API
+
+## Features
+* Support all [Redis Commands](https://redis.io/commands/) (except Cluster related commands)
+* Async support ([tokio](https://tokio.rs/) or [async-std](https://async.rs/))
+* Different client types:
+  * Single client
+  * [Multiplexed](https://redis.com/blog/multiplexing-explained/) client
+  * Pooled client manager (with [bb8](https://docs.rs/bb8/latest/bb8/))
+* Automatic command batching
+* Configuration with Redis URL or dedicated builder
+* [TLS](https://redis.io/docs/manual/security/encryption/) support
+* [Transaction](https://redis.io/docs/manual/transactions/) support
+* [Pub/sub](https://redis.io/docs/manual/pubsub/) support
+* [Sentinel](https://redis.io/docs/manual/sentinel/) support
+* [LUA Scripts/Functions](https://redis.io/docs/manual/programmability/) support
+
+## Roadmap
+* [Cluster](https://redis.io/docs/manual/scaling/) support
+* [Pipelining](https://redis.io/docs/manual/pipelining/) support
+* [RedisJSON](https://redis.io/docs/stack/json/) support