docs: did-go repo overview (#12)

Signed-off-by: Rolson Quadras <[email protected]>

README.md

@@ -8,6 +8,18 @@
 
 # TrustBloc Decentralized Identifier (DID) Go Library
 
+The TrustBloc DID Go repo contains core [W3C Decentralized Identifier (DID)](https://www.w3.org/TR/did-core/) related shared code.
+
+The library has the following implementations.
+- [W3C Decentralized Identifier (DID)](https://www.w3.org/TR/did-core/) Data model
+- DID Method client implementation
+  - [DID Web](https://w3c-ccg.github.io/did-method-web/)
+  - [DID Key](https://w3c-ccg.github.io/did-method-key/)
+  - [DID JWK](https://github.com/quartzjer/did-jwk/blob/main/spec.md)
+  - [DID Sidetree longform](https://identity.foundation/sidetree/spec/)
+  - [DID HTTP Resolver](https://w3c-ccg.github.io/did-resolution/)
+- JSON-LD wrappers built on top of [piprate/json-gold](https://github.com/piprate/json-gold) along with signer and verifier implementation
+
 
 ## License
 Apache License, Version 2.0 (Apache-2.0). See the [LICENSE](LICENSE) file.