Add MOSN and Go Host implementations. (#22)

While there, reorganize the list of implementations to include libraries.

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

Author: PiotrSikora

README.md

@@ -1,31 +1,47 @@
 # WebAssembly for Proxies (ABI specification)
 
-This repositarty contains specification of the low-level Application Binary Interface (ABI) and
+This repository contains specification of the low-level Application Binary Interface (ABI) and
 conventions to use between L4/L7 proxies (and/or other host environments) and their extensions
 delivered as WebAssembly modules.
 
 The event-driven streaming APIs and convenient utility functions were originally developed for
 the [WebAssembly in Envoy] project, but they are proxy-agnostic, and consumers can use the same
 Proxy-Wasm extensions across different proxies.
 
+[WebAssembly in Envoy]: docs/WebAssembly-in-Envoy.md
+
 ## Implementations
 
+### SDKs
+
+* [AssemblyScript SDK]
+* [C++ SDK]
+* [Go (TinyGo) SDK]
+* [Rust SDK]
+
+[AssemblyScript SDK]: https://github.com/solo-io/proxy-runtime
+[C++ SDK]: https://github.com/proxy-wasm/proxy-wasm-cpp-sdk
+[Go (TinyGo) SDK]: https://github.com/tetratelabs/proxy-wasm-go-sdk
+[Rust SDK]: https://github.com/proxy-wasm/proxy-wasm-rust-sdk
+
 ### Host environments
 
-* [Envoy / Istio Proxy]
+#### Servers
+
+* [Envoy]
+* [Istio Proxy] (Envoy-based)
+* [MOSN]
 * [ATS] (proof-of-concept)
 
-### SDKs
+[Envoy]: https://github.com/envoyproxy/envoy
+[Istio Proxy]: https://github.com/istio/proxy
+[MOSN]: https://github.com/mosn/mosn
+[ATS]: https://github.com/jplevyak/trafficserver/tree/wasm
 
-* [C++]
-* [Rust]
-* [AssemblyScript]
-* [TinyGo]
+#### Libraries
 
-[WebAssembly in Envoy]: docs/WebAssembly-in-Envoy.md
-[Envoy / Istio Proxy]: https://github.com/envoyproxy/envoy
-[ATS]: https://github.com/jplevyak/trafficserver/tree/wasm
-[C++]: https://github.com/proxy-wasm/proxy-wasm-cpp-sdk
-[Rust]: https://github.com/proxy-wasm/proxy-wasm-rust-sdk
-[AssemblyScript]: https://github.com/solo-io/proxy-runtime
-[TinyGo]: https://github.com/tetratelabs/proxy-wasm-go-sdk
+* [C++ Host]
+* [Go Host]
+
+[C++ Host]: https://github.com/proxy-wasm/proxy-wasm-cpp-host
+[Go Host]: https://github.com/mosn/proxy-wasm-go-host