A better Rust ATProto crate

couple readme updates

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README.md
··· 101 101 102 102 Highlights: 103 103 104 + - better value type deserialization helpers 105 + - service auth implementation 106 + - XrpcRequest derive Macros 107 + - more builders in generated api to make constructing things easier (lmk if compile time is awful) 104 108 - `AgentSessionExt` trait with a host of convenience methods for working with records and preferences 105 109 - Improvements to the `Collection` trait, code generation, and addition of the `VecUpdate` trait to enable that 106 110 - A bunch of examples, both in the docs and in the repository