Add Cookbook

docs/Cookbook.md

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+# Wasm3 cookbook
+
+### Rust WASI app
+
+TODO
+
+### AssemblyScript WASI app
+
+TODO
+
+### TinyGo WASI app
+
+TODO
+
+### Zig WASI app
+
+Create `hello.zig`:
+```zig
+const std = @import("std");
+
+pub fn main() !void {
+    const stdout = std.io.getStdOut().writer();
+    try stdout.print("Hello, {s}!\n", .{"world"});
+}
+```
+
+```sh
+$ zig build-exe -O ReleaseSmall -target wasm32-wasi hello.zig
+
+$ wasm3 hello.wasm
+Hello, world!
+```
+
+## Zig library
+
+Create `add.zig`:
+```zig
+export fn add(a: i32, b: i32) i64 {
+    return a + b;
+}
+```
+
+```sh
+$ zig build-lib add.zig -O ReleaseSmall -target wasm32-freestanding
+
+$ wasm3 --repl add.wasm
+wasm3> add 1 2
+Result: 3
+```
+
+### C WASI app
+
+The easiest way to start is to use [Wasienv](https://github.com/wasienv/wasienv).
+
+Create `hello.c`:
+```c
+#include <stdio.h>
+
+int main()
+{
+   printf("Hello, %s!\n", "world");
+   return 0;
+}
+```
+
+```sh
+$ wasicc -O3 -Wl,--stack-first hello.c -o hello.wasm
+
+$ wasm3 hello.wasm                      
+Hello, world!
+```
+
+### C++ WASI app
+
+Create `hello.cpp`:
+```cpp
+#include <iostream>
+
+int main()
+{
+    std::cout << "Hello World!" << std::endl;
+    return 0;
+}
+```
+
+```sh
+$ wasic++ -O3 -Wl,--stack-first hello.cpp -o hello.wasm
+
+$ wasm3 hello.wasm
+Hello World!
+```