Update wasm README with deployment instructions (#5743)

* Update wasm README with deployment instructions

* moving instructions to deployment.md

Author: patnir

ironfish-rust-wasm/DEPLOYMENT.md

@@ -0,0 +1,4 @@
+# Deployment Instructions 
+
+1. Create a PR to bump the version in `Cargo.toml` for the `staging` branch. 
+2. After merging the PR, run the following Github Actions workflow: https://github.com/iron-fish/ironfish/actions/workflows/deploy-npm-ironfish-rust-wasm.yml