feat: Create ADOPTERS.md (feast-dev#4410)

* Create ADOPTERS.md

* Update ADOPTERS.md

community/ADOPTERS.md

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+# Adopters of Feast
+
+Below are the adopters of Feast. If you are using Feast please add
+yourself into the following list by a pull request. Please keep the list in
+alphabetical order.
+
+| Organization | Contact | GitHub Username |
+| ------------ | ------- | ------- | 
+| Affirm  | Francisco Javier Arceo | franciscojavierarceo |
+| Bank of Georgia | Tornike Gurgenidze | tokoko | 
+| Get Ground | Zhiling Chen | zhilingc | 
+| Gojek  | Pradithya Aria Pura | pradithya |
+| Twitter  | David Liu | mavysavydav|
+| Shopify  | Matt Delacour | MattDelac |
+| Snowflake | Miles Adkins | sfc-gh-madkins |