Add Tools.md (rustwasm#41)

Author: joaolucasl

src/tools.md

@@ -0,0 +1,24 @@
+# Tools
+
+Now that you we have learned how to generate our first WebAssembly "Hello World" with Rust, 
+it is time to check what tooling is avaiable in the language. 
+There are several great tools already written for WebAssembly (most of them written in C++). 
+[Wabt](https://github.com/WebAssembly/wabt), for instance, is a suite of tools built to be a starting point for manipulating WebAssembly files.
+
+However, since Rust has the potential to be used for both development and tooling for WebAssembly, several tools written in it have popped up in the ecosystem:
+- [wasm-gc](https://github.com/alexcrichton/wasm-gc) - "a small command to gc a wasm module and remove all unneeded exports, imports, functions, etc."
+- [wasm-nm](https://github.com/fitzgen/wasm-nm) - "list the symbols within a wasm file".
+- [wasm-snip](https://github.com/fitzgen/wasm-snip) - "replaces a wasm function body with unreachable"
+- [rustwasm](https://github.com/joshuawarner32/rust-wasm) - A wasm interpreter in Rust
+- [wasmi](https://github.com/pepyakin/wasmi) - A wasm interpreter in Rust,
+- [parity-wasm](https://github.com/paritytech/parity-wasm) - wasm (de)serialization in Rust,
+- [wasmparser](https://github.com/yurydelendik/wasmparser.rs) - A wasm binary decoder with optional validation, in Rust
+- [wasmtext](https://github.com/yurydelendik/wasmtext) - prints wasm modules in text format, in Rust
+- [wasmstandalone](https://github.com/sunfishcode/wasmstandalone) - standalone JIT-based wasm runner, in Rust, using Cretonne, in early development
+
+There's also plenty of _space for tooling to be be built or rewritten in Rust_ for better syngerny with the ecosystem. Some of them include:
+- [A wasm size profiler](https://github.com/rust-lang-nursery/rust-wasm/issues/20)
+- A [Wabt](https://github.com/WebAssembly/wabt) rewrite in Rust
+- Tools for the [ewasm project](https://github.com/ewasm)
+
+This page is meant to be a living document, so feel free to send us a pull request adding new incredible WebAssembly tools we might have missed or when they are released in the future!