Update README.md

Author: fabianfett

README.md

@@ -1,8 +1,14 @@
 # swift-pure-json
 
-A description of this package.
+[![Swift 5.1](https://img.shields.io/badge/Swift-5.1-blue.svg)](https://swift.org/download/)
+[![github-actions](https://github.com/fabianfett/pure-swift-json/workflows/CI/badge.svg)](https://github.com/fabianfett/pure-swift-json/actions)
+[![codecov](https://codecov.io/gh/fabianfett/pure-swift-json/branch/master/graph/badge.svg)](https://codecov.io/gh/fabianfett/pure-swift-json)
+![macOS](https://img.shields.io/badge/os-macOS-green.svg?style=flat)
+![tuxOS](https://img.shields.io/badge/os-tuxOS-green.svg?style=flat)
+
+This package provides a json encoder and decoder in pure Swift (without the use of Foundation). 
+The implementation shall be [RFC8259](https://tools.ietf.org/html/rfc8259) complient.
 
-https://tools.ietf.org/html/rfc8259
 
 ### Goals
 
@@ -11,6 +17,18 @@ https://tools.ietf.org/html/rfc8259
 - [x] No external dependencies other than the Swift STL
 - [x] Faster than Foundation implementation
 
-### Alternatives
+### Status
+
+**Note**: Don't use this. This is under heavy development and will be changed a lot!
 
+Currently the focus areas are:
+
+- This needs **a lot** of tests to ensure correct working and safety against attackers
+- Fix all `preconditionFailure("unimplemented")`
+- Find a way how to allow parsing of `Date` and `Data`
+- Support decoding of other unicode encodings (currently only utf-8 supported)
+
+### Alternatives
 
+- [IkigaJSON](https://github.com/autimatisering/IkigaJSON)
+- [Foundation Coding](https://github.com/apple/swift-corelibs-foundation/blob/master/Sources/Foundation/JSONEncoder.swift)