Move the more advanced ways to use cg_clif to usage.md

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+# Usage
+
+rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects.
+
+Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`prepare.sh` and `build.sh` or `test.sh`).
+
+## Cargo
+
+In the directory with your project (where you can do the usual `cargo build`), run:
+
+```bash
+$ $cg_clif_dir/build/cargo.sh build
+```
+
+This will build and run your project with rustc_codegen_cranelift instead of the usual LLVM backend.
+
+## Rustc
+
+> You should prefer using the Cargo method.
+
+```bash
+$ $cg_clif_dir/build/bin/cg_clif my_crate.rs
+```
+
+## Jit mode
+
+In jit mode cg_clif will immediately execute your code without creating an executable file.
+
+> This requires all dependencies to be available as dynamic library.
+> The jit mode will probably need cargo integration to make this possible.
+
+```bash
+$ $cg_clif_dir/build/cargo.sh jit
+```
+
+or
+
+```bash
+$ $cg_clif_dir/build/bin/cg_clif -Cllvm-args=mode=jit -Cprefer-dynamic my_crate.rs
+```
+
+There is also an experimental lazy jit mode. In this mode functions are only compiled once they are
+first called. It currently does not work with multi-threaded programs. When a not yet compiled
+function is called from another thread than the main thread, you will get an ICE.
+
+```bash
+$ $cg_clif_dir/build/cargo.sh lazy-jit
+```
+
+## Shell
+
+These are a few functions that allow you to easily run rust code from the shell using cg_clif as jit.
+
+```bash
+function jit_naked() {
+    echo "$@" | $cg_clif_dir/build/bin/cg_clif - -Cllvm-args=mode=jit -Cprefer-dynamic
+}
+
+function jit() {
+    jit_naked "fn main() { $@ }"
+}
+
+function jit_calc() {
+    jit 'println!("0x{:x}", ' $@ ');';
+}
+```