Create a FATE-experimental Repo

[snowzjx]

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Is your feature request related to a problem? Please describe. Create a new Github Repo 'FATE-experimental' to host experimental code. The repo can benefit research or non-production feature developments of FATE. The code in FATE-experimental can be merged into FATE after obtaining approval from the TSC.

Describe the solution you'd like

1. Create a new Github Repo 'FATE-experimental' on Github.
2. Create documents to illustrate the goal of the 'FATE-experimental' repo.
3. Create documents to establish the code merging mechanism from 'FATE-experimental' to 'FATE'.

Describe alternatives you've considered NA

Additional context NA