docs: readme with features & usage

README.md

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+<div align="center" style="text:align:center">
+  <img src="docs/media/logo.png" width="60%">
+</div>
+
+## Features
+
+Available:
+
+- Markdown support (Github flavored)
+- Note version history
+- Automatic note expiration via `@exp:` title prefixes
+- Keyboard navigation support
+- User account administration
+
+Waiting to be implemented:
+
+- (Bulk) import/export (Markdown, PDF)
+- Webhooks
+
+## Usage
+
+The Dockerized app can be run in fullstack (`docker-compose-full.yml`) and backend (`docker-compose-back.yml`) modes. In backend mode only the Golang server (and the Postgres database) are containerized and the frontend can be run separately for quicker development (`npm run dev`). The default fullstack setup defaults to exposing port 3000.
+
+The `./scripts/run_dev.sh -h` output can be used as reference of running each of the available modes (or purging data from previous test runs with `-p` or `-q`):
+
+```
+[?] usage: ./scripts/run_dev.sh [-h|-f|-p]
+	-f run both frontend and backend (default: false)
+	-p purge any existing database artifacts (default: false)
+	-q only purge old data without building/spawning any new containers (default: false)
+```