update readme

Author: jazzsequence

README.md

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 # D&D Battle Tracker ⚔️
+![version badge](https://img.shields.io/github/package-json/v/jazzsequence/DnD-Battle-Tracker)
+
 A simple battle tracking system for Dungeons & Dragons written in JavaScript to track initiative and damage.
+
+![Animated Demo](https://media.giphy.com/media/chb2RfSawhoj7KYyvb/giphy.gif)
+
+## Description
+
+I originally built this as an experiment after finishing [Wes Bos](https://github.com/wesbos)' [ES6 for Everyone](https://es6.io/) course to test my newfound JavaScript knowledge, put some of the things he talked about into practice, and to scratch my own itch; at the time I had just started running a D&D campaign for my kids.
+
+After completing his [CSS Grid](https://cssgrid.io/) course, I decided to revisit this again to add some much-needed styling and layout.
+
+Next up is integrating browser storage and possibly refactoring as a React app.
+
+## Roadmap
+These are things I plan (or at least _hope_) to implement in the future.
+
+* Use browser storage to retain party data after refresh
+* Allow encounters to be reset without losing data
+* Initiative randomizer (define initiative rather than entering rolled values)
+* Attack options (each character/monster has their attacks & damage listed so dealing damage can be done by just clicking the button next to that attack type)
+* Unit tests and linting
+* More?
+
+## Changelog
+
+### 0.2.0
+* added build tools
+* added styling and layout
+* some minor tweaks to initiative tracker and messages
+* expanded readme
+
+### 0.1.0
+* Initial release