add general README

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 # mozaic4
 
 Because third time's the charm!
+
+# pwcli
+Note: this project is under active development. All file and configuration formats will take some time to stabilize, so be prepared for breakage when you upgrade to a new version.
+## Building
+
+The cli comes with a local webserver for visualizing matches.
+Therefore, you'll have to build the web application first, so that it can be embedded in the binary.
+
+You will need:
+- rust
+- wasm-pack
+- npm
+
+First, build the frontend:
+```bash
+cd web/pw-frontend
+npm install
+npm run build-wasm
+npm run build
+```
+
+Then build the backend:
+```bash
+cd planetwars-cli
+cargo build --bin pwcli --release
+```
+
+You can install the binary by running
+```bash
+cargo install --path .
+```
+
+## Getting started
+First, initialize your workspace:
+```bash
+pwcli init my-planetwars-workspace
+```
+This creates all required files and directories for your planetwars workspace:
+- `pw_workspace.toml`: workspace configuration
+- `maps/`:  for storing maps
+- `matches/`: match logs will be written here
+- `bots/simplebot/` an example bot to get started 
+
+All subsequent commands should be run from the root directory of your workspace.
+
+Try playing an example match:
+```bash
+pwcli run-match hex simplebot simplebot
+```
+
+You can now watch a visualization of the match in the web interface:
+```bash
+pwcli serve
+```
+
+You can now try writing your own bot by copying the `simplebot` example. Don't forget to add it in your workspace configuration!