Add README with usage instructions and workflow

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -0,0 +1,47 @@
+# Evolve Save Editor
+
+CLI tool for editing [Evolve](https://pmotschmann.github.io/Evolve/) browser game save files.
+
+Export your save in Evolve (Settings > Export), run a command, and import the modified save back.
+
+## Setup
+
+```bash
+npm install
+```
+
+## Usage
+
+The tool reads save data from your **clipboard** by default (or from stdin/argument), applies edits, and copies the result back to the clipboard.
+
+```bash
+# Max all capped resources
+node index.js --max-resources
+
+# Set all crafted (unlimited) resources to 100,000
+node index.js --set-crafted=100000
+
+# Combine both
+node index.js --max-resources --set-crafted=100000
+
+# Read from stdin instead of clipboard
+node index.js --max-resources < save.txt
+
+# Print result to stdout instead of copying to clipboard
+node index.js --max-resources --no-copy
+```
+
+## Options
+
+| Flag | Description |
+|------|-------------|
+| `--max-resources` | Set all capped resources (`max > 0`) to their max |
+| `--set-crafted=N` | Set all unlimited/crafted resources (`max == -1`) to N |
+| `--no-copy` | Print the edited save to stdout instead of clipboard |
+| `--help` | Show help |
+
+## Workflow
+
+1. In Evolve, go to **Settings > Export** (copies save to clipboard)
+2. Run `node index.js --max-resources`
+3. In Evolve, go to **Settings > Import** (pastes from clipboard)