Initial reorg.

This is largely the same as #305, but updated for the current tree.

crates/misc/rust/examples/markdown.rs

@@ -0,0 +1,13 @@
+use wasmtime_rust::wasmtime;
+
+#[wasmtime]
+trait WasmMarkdown {
+    fn render(&mut self, input: &str) -> String;
+}
+
+fn main() -> anyhow::Result<()> {
+    let mut markdown = WasmMarkdown::load_file("markdown.wasm")?;
+    println!("{}", markdown.render("# Hello, Rust!"));
+
+    Ok(())
+}