Add a few infra files, document basic flow in README

README.md

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+This repository is a home of Ward wallet - a crypto wallet for Cosmos-compatible chains,
+currently deployed on Injective testnet.
+
+*Ward - bigger inside than it appears.*
+
+## Building the contracts
+
+In every sub-crate under [contracts](./contracts/), run `cargo run-script optimize` to
+build desired code in `artifacts` folder. See `up.sh` script for reference, it works
+with local `wasmd` chains.
+
+## Building the extension (frontend)
+
+In [ui](./ui/) folder, execute `npm install` and `npm run build` to build the code.
+
+Resulting `ui/build` folder can be used as a ready-to-use Chrome extension (installable in
+developer mode). It can also be packed into `.crx` archive in Chrome for easier sharing.
+
+In case of any failures, pre-built `.crx` for Injective testnet is attached to the latest release.
+
+We rely on `patch-package` to fix broken dependencies, but I cannot say for sure that
+all necessary patches are kept there - development was too rapid due to extremely tough
+deadlines.