Add source for for wasi-experimental-http-wasmtime.

crates/wasi-experimental-http-wasmtime/Cargo.toml

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+[package]
+    name        = "wasi-experimental-http-wasmtime"
+    version     = "0.10.0"
+    authors     = [ "Radu Matei <[email protected]>" ]
+    edition     = "2021"
+    repository  = "https://github.com/deislabs/wasi-experimental-http"
+    license     = "MIT"
+    description = "Experimental HTTP library for WebAssembly in Wasmtime"
+    readme      = "readme.md"
+
+[dependencies]
+    anyhow = "1.0"
+    bytes = "1"
+    futures = "0.3"
+    http = "0.2"
+    reqwest = { version = "0.11", default-features = true, features = [
+        "json",
+        "blocking",
+    ] }
+    thiserror = "1.0"
+    tokio = { version = "1.4.0", features = [ "full" ] }
+    tracing = { version = "0.1", features = [ "log" ] }
+    url = "2.2.1"
+    wasmtime = { workspace = true }

crates/wasi-experimental-http-wasmtime/readme.md

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+# `wasi-experimental-http-wasmtime`
+
+![Crates.io](https://img.shields.io/crates/v/wasi-experimental-http-wasmtime)
+
+Experimental HTTP library for WebAssembly in Wasmtime
+
+### Adding support to a Wasmtime runtime
+
+The easiest way to add support is by using the
+[Wasmtime linker](https://docs.rs/wasmtime/0.26.0/wasmtime/struct.Linker.html):
+
+```rust
+let store = Store::default();
+let mut linker = Linker::new(&store);
+let wasi = Wasi::new(&store, ctx);
+
+// link the WASI core functions
+wasi.add_to_linker(&mut linker)?;
+
+// link the experimental HTTP support
+let allowed_hosts = Some(vec!["https://postman-echo.com".to_string()]);
+let max_concurrent_requests = Some(42);
+
+let http = HttpCtx::new(allowed_domains, max_concurrent_requests)?;
+http.add_to_linker(&mut linker)?;
+```
+
+The Wasmtime implementation also enables allowed domains - an optional and
+configurable list of domains or hosts that guest modules are allowed to send
+requests to. If `None` or an empty vector is passed, guest modules are **NOT**
+allowed to make HTTP requests to any server. (Note that the hosts passed MUST
+have the protocol also specified - i.e. `https://my-domain.com`, or
+`http://192.168.0.1`, and if making requests to a subdomain, the subdomain MUST
+be in the allowed list. See the the library tests for more examples).