Intro to Substrate MOOC - Module 2

[CrackTheCode016]

Second module of the Substrate MOOC.

Tracking issue: https://github.com/w3f/w3f-education/issues/60

todo

• [x] Substrate (FRAME) Development 101 - Crucial Concepts
• [x] FRAME - Runtime
• [x] FRAME - Storage
• [x] FRAME - Pallets

[CrackTheCode016]

Note: Changed the title to "Introduction to FRAME", as it is simpler and that's what it does anyway

[CrackTheCode016]

@DrW3RK Feedback addressed and conflicts fixed, feel free to merge or suggest anything else!