add README to docs/

docs/README.md

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+Here are stored most of the docs of the Haveno project:
+
+- [installing.md](installing.md ) - Instructions for running a local test network
+- [bounties.md](bounties.md) - Rules and description of the bounty program
+- [CONTRIBUTING.md](CONTRIBUTING.md) - Guidelines for contributors
+- [data-stores.md](data-stores.md) - Instructions for updating data stores (from Bisq)
+- [idea-import.md](idea-import.md) - Instructions for importing Haveno as an IntelliJ IDEA project (from Bisq))
+- [README.md](README.md) - This file
+- [tor-upgrade.md](tor-upgrade.md) - Instructions for upgrading the Tor dependencies used by Haveno (from Bisq)
+- [trade-protocol.md](trade-protocol.md) - The description of Haveno's trade protocol
+
+Documents outside of this folder:
+
+- [FAQ](https://github.com/haveno-dex/haveno/wiki/FAQ) - Common questions and answers