Added Typescript Section and Todo Application Tutorial with Typescript

[godwintrav]

Description

This changes adds a Typescript Section under the Web Applications section and also adds a Todo Application Typescript course under the typescript section.

Motivation and Context

This change is required because there are no courses or tutorials for learning Typescript and that is why this has been added.

How Has This Been Tested?

It has been tested by previewing Readme.md and clicking the course link to ensure it works as expected.

Types of changes

• Content Update (change which fixes an issue or updates an already existing submission)
• New Article (change which adds functionality)
• Documentation change

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have made checks to ensure URLs and other resources are valid