Add README

README.md

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+# Pflänz.li
+
+[![License: AGPL v3](https://img.shields.io/badge/License-AGPL_v3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0)
+
+## Idea
+A platform where people can trade their plants. You can post what you have and search for others with [filters](#filters). The aim is to make it easier to trade plants and collect as few data as possible. Only the email/username and a postal code is required.
+
+## Tech stack
+- [Django](https://djangoproject.com/)
+- [MariaDB](https://www.postgresql.org/)
+
+## Admin dashboard
+Find it under `/admin`
+
+## Filters
+
+### Implemented
+- Distance between postal codes
+- Search within title
+
+### Ideas
+It would be nice to have categories somehow, but it would be hard to make it comprehensive.
+
+:warning: This list is work in progress!
+
+Searching with filters such as:
+| Filter Name  | Type          | Input type |
+|--------------|---------------|------------|
+| Indoor only  | `boolean`     | checkbox   |
+| Name         | `string`      | textfield  |
+| Category     | `Category`    | dropdown   |
+
+## Development
+To get started with development, see [DEVELOPMENT.md](DEVELOPMENT.md)