Update README

Author: stevenroose

README.md

@@ -2,15 +2,51 @@
 bitcoin-scriptexec
 ==================
 
-A Bitcoin Script execution utility.
+A work-in-progress Bitcoin Script execution utility.
 
+**DISCLAIMER: DO NOT EVER, EVER, TRY TO USE THIS CRATE FOR CONSENSUS PURPOSES !!**
+
+
+# Status
+
+This project is a work-in-progress mostly attempting to facilitate BitVM development.
+It does not yet fully implement all opcodes, but as a library already gives you pretty
+good insight into the internals of the execution in a step-wise manner.
 
 
 # Usage
 
-Currently, just install `cargo` and run following command:
+## CLI
+
+You can simply use `cargo run` or build/intall the binary as follows:
+
+```
+# to build in debug mode
+$ cargo build --locked
+# to build in release (optimized) mode
+$ cargo build --locked --release
+# to install in ~/.cargo/bin
+$ cargo install --locked --path .
+```
+
+### Usage
+
+The CLI currently takes only a single argument: the path to the ASM script file:
+
 ```
-$ cargo run -- <filename-with-script-asm.bs>
+# using the binary
+$ btcexec <script.bs>
+# using cargo run
+$ cargo run -- <script.bs>
 ```
 
+## WASM
+
+There are wasm bindings provided. For API documentation, see the `src/wasm.rs`a file.
 
+To build the WASM bindings, [install wasm-pack](https://rustwasm.github.io/wasm-pack/installer/)
+and then run the following script:
+
+```
+./build-wasm.sh
+```