docs(README): add features and notes section

Author: GodderE2D

README.md

@@ -2,6 +2,20 @@
 
 An easy, beginner-friendly [PostgreSQL](https://www.postgresql.org/) database wrapper similar to [quick.db](https://github.com/lorencerri/quick.db).
 
+## Features
+
+- Near identical syntax to [quick.db](https://github.com/lorencerri/quick.db)
+- Never worry about constant database corruptions again
+- Fully flexible, uses [pg](https://github.com/brianc/node-postgres) internally
+- Relies on [ES6 promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) (`async`/`await`, `.then()`)
+
+If you don't know about [quick.db](https://github.com/lorencerri/quick.db), quickpostgres also has:
+
+- **Persistent storage** - all data is stored on your PostgreSQL database
+- **Easy to setup** - All you need is a PostgreSQL database to setup
+- **Beginner friendly** - Use simple syntax with dot notation
+- **No learning curve** - 0 learning curve if you're coming from [quick.db](https://github.com/lorencerri/quick.db) or [quickmongo](https://github.com/DevSnowflake/quickmongo)
+
 ## Installation
 
 You can easily install quickpostgres using your preferred package manager.
@@ -76,6 +90,11 @@ If you spot a bug or you have a feature request, please open a [GitHub issue](ht
 
 If you spot a security vulnerability, please [contact me](mailto:[email protected]).
 
+## Notes
+
+- Some users consider [quick.db](https://github.com/lorencerri/quick.db) non-suitable in the long term, reason being it uses [SQLite](https://www.sqlite.org/index.html), and is not easily scalable. However, since quickpostgres uses [PostgreSQL](https://www.postgresql.org/), one of the best production-grade database system out there, quickpostgres is suitable for production usage, in terms of performance.
+- Quickpostgres is meant for beginners, and uses a JSON-feeling database. If you want to use the full advantages of [PostgreSQL](https://www.postgresql.org/), we highly recommend you switching to something else.
+
 ## License
 
 [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0)