[native] Add license for sqlite_orm

Summary:
Add the correct license for sqlite_orm in the native/cpp/lib/sqlite_orm directory.

The first part of ENG-33: https://linear.app/comm/issue/ENG-33/add-license-file-for-sqlite-orm

Test Plan: No testing needed for this

Reviewers: atul, ashoat, jon

Reviewed By: atul, ashoat

Subscribers: ginsu, tomek, abosh

Differential Revision: https://phab.comm.dev/D5294