fix(did_parser): Add readme and simple example (#1047)

did_parser/README.md

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+# did_parser
+
+## Overview
+Rust crate for parsing [DIDs](https://www.w3.org/TR/did-core/#did-syntax) and [DID URLs](https://www.w3.org/TR/did-core/#did-url-syntax).
+
+## Features
+- **DID Parsing**: Capability to parse `did:` strings, ensuring they comply with the DID specifications.
+- **DID URL**: Functionality to parse DID URLs.
+
+## Getting Started
+### Installation
+Add the did_parser library as a dependency in your `Cargo.toml` file:
+```toml
+[dependencies]
+did_parser = { tag = "0.61.0", git = "https://github.com/hyperledger/aries-vcx" }
+```
+
+## Demo
+To get you off the ground, have a look at the [demo](./examples/demo.rs). It demonstrates a basic functionality. You can run the demo with the following command:
+```bash
+cargo run --example demo
+```
+

did_parser/examples/demo.rs

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+use did_parser::{Did, DidUrl};
+
+fn main() {
+    // parse a string into DID
+    let did = Did::parse("did:web:w3c-ccg.github.io".into()).unwrap();
+    println!("{:?}", did.did());
+    println!("{:?}", did.method());
+    println!("{:?}", did.id());
+
+    // parse a string into DID URL
+    let did_url =
+        DidUrl::parse("did:example:123456789abcdefghi/foo;param=value?query=value".into()).unwrap();
+    println!("{:?}", did_url.did());
+    println!("{:?}", did_url.did_url());
+    println!("{:?}", did_url.method());
+    println!("{:?}", did_url.id());
+    println!("{:?}", did_url.path());
+    println!("{:?}", did_url.queries());
+}