readme: added readme

README.md

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+# BuildPath
+a tool for League of Legends champions runes and build paths
+
+https://buildpath.win
+
+## Architecture
+
+BuildPath is made of four components:
+- a MongoDB document database
+- `patch_detector`, a daemon which runs periodically to detect new League of Legends patch from official APIs
+- `match_collector`, a daemon which runs periodically to collect matches from League of Legends challenger players on current patch, and generate statistics from those matches, saving them in the database
+- `frontend`, which is a Nuxt.JS project hosting an API serving the statistics but also the full web frontend (Vue.JS)
+
+## Development
+
+### Getting started
+
+Developing BuildPath requires Docker for a local MongoDB instance, and a NodeJS/npm installation.
+
+BuildPath needs data to work, either for generating statistics in the `match_collector` or for the frontend.
+
+In order to download a production snapshot with data, import them into a local MongoDB instance and re-generate champion statistics, just use:
+```bash
+node dev/scripts/setup-db.js
+```
+
+You can re-run the script to re-generate statistics, and it won't re-download data.
+
+Afterwards, if you want to run the frontend:
+```bash
+cd frontend && npm run dev
+```
+
+### Code quality
+
+Every subproject has `lint` and `format` targets:
+```
+npm run format # Format code
+npm run lint   # Run the linter
+```
+
+Please make sure those are run without errors before committing.