Added TypeScript language description. blackbird71SR#73

## Description
## Types of changes
 - [] Bug fix or improving code quality
 - [] New language
 - [] New feature
 - [x] Add language description
## Checklist:
- [x] My code follows the code style of this project.
- [x] I have updated the documentation accordingly.

README.md

@@ -198,6 +198,8 @@ Swift is a general-purpose, multi-paradigm, compiled programming language develo
 
 - [x] **TypeScript**
 
+TypeScript is an open-source programming language developed and maintained by Microsoft. It is a strict syntactical superset of JavaScript, and adds optional static typing to the language. TypeScript is designed for development of large applications and transcompiles to JavaScript.
+
 - [x] **VB.NET**
 
 - [x] **Whitespace**