Add readme

README.md

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+# plant-exchange
+
+## Idea
+A platform where people can exchange plants. They can post what they have and search for others with [filters](#filters).
+
+## Tech stack
+- [Symfony](https://symfony.com/)
+- [PostgreSQL](https://www.postgresql.org/), maybe should be using MySQL for easier deployment?
+
+Deployment: TBD
+
+## Admin dashboard
+Find it under `/admin`
+
+## Filters
+: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   |