feat: initialize Bounty Bulleting Board smart conract

contracts/src/blockchain/contracts/bounty/BountyBulletinBoardContract.ts

@@ -0,0 +1,56 @@
+import {
+    SmartContract,
+    method,
+    DeployArgs,
+    Permissions,
+    UInt64,
+    PublicKey,
+    Signature,
+    MerkleWitness,
+  } from 'o1js';
+
+  /*
+  * Merkle Tree witness with a depth of 5. This number is beint iterated upon.
+  */
+  class MerkleWitness5 extends MerkleWitness(5) {}
+
+  /**
+   * Bounty Bulletin Board is the smart contract that exposes the "Fund Bounty" and "Claim Bounty" interfaces.
+   * 
+   * In the "Fund Bounty" phase, a bounty with a particular ID is funded. In this process, the $ZKL amount
+   * associated with the bounty represented by (funder_addres, bounty_id) is locked up in the contract.
+   * 
+   * In the "Claim Bounty" phase, a bounty with a particular ID is claimed. In this process, the the $ZKL amount
+   * associated with the (funder_addres, bounty_id) key is transferred to the claimer_address.
+   * 
+   * This smart contract is an iterative development of the Bounty Bulletin Board standard, which will be materialized
+   * in a set of hierarchical interfaces and implementaions.
+   */
+  export class BountyBulletinBoardContract extends SmartContract {
+
+    @method fundBounty(
+      funderAddress: PublicKey,
+      bountyId: UInt64, // the size of the tree will be fixed, but a self-replication mechanism will be implemented
+      zklAmount: UInt64,
+      witness: MerkleWitness5, // path to (funderAddress, bountyId) in the merkle tree
+      zkAmountBefore: UInt64, // the amount of $ZKL in the funder's account before the funding
+      funderSignature: Signature // checking whether this is required, and what will it contain
+    ) {
+      // 1. Verify that current $ZKL amount in the funder's account is equal to zkAmountBefore
+      // 2. Transfer the zklAmount from the sender's account to the contract's account
+      // 3. Increment the amount by zklAmount
+      // 4. Update the merkle tree root with zkAmountBefore + zklAmount
+    }
+
+    deploy(args: DeployArgs) {
+      super.deploy(args);
+      this.account.permissions.set({
+        ...Permissions.default(),
+        editState: Permissions.proofOrSignature(),
+      });
+    }
+
+    @method init() {
+        super.init();
+    } 
+}