Add rpc call list in Readme

[chabroA]

Add reference of supported rpc calls / methods in Readme

Depends on that included a rework of the Readme:

• https://github.com/LedgerHQ/eth-dapp-browser/pull/15

cf. https://ledgerhq.atlassian.net/browse/LIVE-3267

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Name	Status	Preview	Updated
eth-dapp-browser	✅ Ready (Inspect)	Visit Preview	Aug 23, 2022 at 8:46AM (UTC)