Create design proposal for the FT Metadata Views

[alilloig]

This belongs to #73 epic

Issue To Be Solved

We need to develop a design document showing the plan for implementing Metadata Views for fungible tokens.

Suggest A Solution

Create a design document similar to a FLIP document with motivation, design summary, tradeoffs, docs plans, etc

Draft proposal (will be posted in #73 when complete)

[alilloig]

From the epic description, this is the first thing we need to figure out, all three points closely tied imho

• Should the views go in the regular MetadataViews contract in the NFT repo or create a new contract?
• Can we re-use existing views, or does it not make sense to get them mixed up?
• Need to define a display view, a path information view, a license view, externalURL, any more?