docs: add dev and deploy info to readme

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2018 joe fleming (https://github.com/w33ble)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# cannabis-dosing
+
+![license](https://img.shields.io/badge/license-MIT-blue.svg)
+
+Cannabis dosing calculator, useful for making oils, tinctures, butters, etc.
+
+[https://cannabis-dosing.web.app](https://cannabis-dosing.web.app)
+
+## Development
+
+```sh
+yarn
+yarn dev
+```
+
+The `dev` script will start a simple web server. Note there is no automatic reloading.
+
+## Deployment
+
+If you are deploying to firebase, run `firebase init` to configure the project, then run the deploy script.
+
+```sh
+yarn deploy
+```
+
+If deploying somewhere else simply deploy the `dist` path.
+
+## License
+
+MIT © [w33ble](https://github.com/w33ble)