new: runtime and transport-module doc skeleton (#2)

Signed-off-by: Gaukas Wang <[email protected]>

runtime/go.md

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+---
+layout: default
+title: Runtime Library in Go
+parent: Runtime Library
+nav_order: 1
+---
+
+# Runtime Library in Go
+
+WATER Runtime Library for Go (a.k.a. `water-go`).

runtime/runtime.md

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+---
+layout: default
+title: Runtime Library
+nav_order: 1
+has_children: true
+permalink: /runtime.html
+---
+
+# Runtime Library
+
+WATER provides runtime libraries in multiple programming languages to support the execution of [WebAssembly Transport Modules](/transport-module.html) (WATM) in different applications. A WATER runtime library includes a set of APIs providing a network programming interface for the integrating application to communicate with the WATM, and a WebAssembly runtime to compile/interpret and execute the WATM. 
+
+## Available Runtime Libraries
+
+Currently, we offer the following runtime libraries:
+- Go: [water](https://github.com/refraction-networking/water)
+- Rust: [water-rs](https://github.com/refraction-networking/water-rs)
+
+Please see the documentation for each runtime library for more details.

runtime/rust.md

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+---
+layout: default
+title: Runtime Library in Rust
+parent: Runtime Library
+nav_order: 1
+---
+
+# Runtime Library in Rust
+
+WATER Runtime Library for Rust (a.k.a. `water-rs`).

transport-module/go.md

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+---
+layout: default
+title: WebAssembly Transport Module in Go
+parent: WebAssembly Transport Module
+nav_order: 1
+---
+
+# WebAssembly Transport Module (WATM) in Go
+

transport-module/rust.md

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+---
+layout: default
+title: WebAssembly Transport Module in Rust
+parent: WebAssembly Transport Module
+nav_order: 2
+---
+
+# WebAssembly Transport Module (WATM) in Rust
+

transport-module/transport-module.md

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+---
+layout: default
+title: WebAssembly Transport Module
+nav_order: 2
+has_children: true
+permalink: /transport-module.html
+---
+
+# WebAssembly Transport Module (WATM)
+
+WebAssembly Transport Module (WATM) is a WebAssembly module that provides a set of APIs and act as a transport layer for applications integrating WATER. With the standardized WATM API, it is designed to be a lightweight and portable module that can be easily executed in any WATER Runtime.
+
+## Build a WATM
+
+Theoretically, you can write a WATM in any programming language that compiles to WebAssembly, since a WATM that fully implements the WATM API can be executed in any properly implemented WATER Runtime. 
+
+For reference, we provide simple examples of WATMs written in Go and Rust, as well as helper libraries to simplify the development of WATMs in these languages. The ultimate goal is to provide a way to build a WebAssembly-agnostic transport protocol into a WATM without requiring the developer to understand the details of WebAssembly.