GITBOOK-223: Add overview for Clarity contracts

Author: kenrogers

concepts/sbtc/clarity-contracts/README.md

@@ -1,2 +1,39 @@
 # Clarity Contracts
 
+This graph summarizes the overall of the Clarity portion of the sBTC protocol.
+
+Throughout this section, we'll expand on each contract and its functionality.
+
+<figure><img src="https://lh7-rt.googleusercontent.com/docsz/AD_4nXe6LEEESrk6Az-iRR5ZeEuqOQvBESKtFvBIjSYPhAjLZ2LpEwM-UOnSWn4b6hFFv0uFnysxL6wO-BVgJaPTAdYUkbvBenJrY8rY-YrGT9CSwqdCl2kuS5ZhNheumR-yBPAOHtccAt1eOD4dU5Zi-14gBgwv?key=uPKXlfIDnNUlnyka_NtgIw" alt=""><figcaption></figcaption></figure>
+
+### sBTC Clarity Contracts
+
+At a high level, the sBTC Clarity contracts are responsible for the following:
+
+#### sbtc-bootstrap signers
+
+Core contract for meta signer functionality such as registration & the rotation process.
+
+#### sbtc-deposit
+
+Processing contract called by the signers to record a consumed Bitcoin transaction & mint some amount of sBTC to a principal contained in the payload.
+
+#### sbtc-registry
+
+State storage for maintaining upgradability across protocol.
+
+#### sbtc-withdrawal
+
+Interaction points for users and signers to update withdrawal request state.
+
+### User Types
+
+In addition to the contracts themselves, there are two main user types that will interact with these contracts.
+
+#### Signer
+
+A signer that is part of the current sBTC signer set. More information on signers and their role in sBTC can be found in the [Signer Process Walkthrough](../walkthroughs/signer-process.md).
+
+#### Wallet
+
+A participant in the Stacks/Bitcoin ecosystem that wants to deposit/withdraw/use sbtc.