chore: basic readme

readme.md

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+# Superbridge token lists
+
+We use this repository for accepting token listings on [superbridge.app](https://superbridge.app).
+
+To get your token listed, simply open a PR adding the relevant file to the `data` folder. Checks will run to ensure this token is a valid and bridgeable token. For reference, please see [the example](https://github.com/superbridgeapp/token-lists/pull/11) of a valid token listing PR.
+
+Please note that for most token listings your PR will need either,
+
+- to be created by a representative of the project
+- include have a verifying tweet from the project Twitter account.