feat: define Quest structs and DataKeys for QuestEngine

Cargo.toml

@@ -3,6 +3,7 @@ resolver = "2"
 members = [
   "contracts/course-registry",
   "contracts/reward-pool",
+  "contracts/quest-engine"
 ]
 
 [workspace.dependencies]

contracts/Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = ["course-registry", "reward-pool"]
+members = ["course-registry", "quest-engine", "reward-pool"]
 resolver = "2"
 
 [workspace.dependencies]

contracts/quest-engine/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "quest-engine"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+soroban-sdk = { workspace = true }

contracts/quest-engine/src/lib.rs

@@ -0,0 +1,15 @@
+#![no_std]
+
+pub mod types;
+
+// Added contractimpl to the import list here
+use soroban_sdk::{contract, contractimpl};
+
+#[contract]
+pub struct QuestEngineContract;
+
+// We will implement contract functions in future issues.
+#[contractimpl]
+impl QuestEngineContract {
+    // Empty for now to satisfy the compiler
+}

contracts/quest-engine/src/types.rs

@@ -0,0 +1,33 @@
+use soroban_sdk::{contracttype, Address};
+
+#[contracttype]
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum QuestType {
+    Build,
+    Explore,
+}
+
+#[contracttype]
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct Quest {
+    pub employer: Address,
+    pub reward_amount: i128,
+    pub quest_type: QuestType,
+    pub active: bool,
+}
+
+#[contracttype]
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum SubmissionStatus {
+    Pending,
+    Approved,
+    Rejected,
+}
+
+#[contracttype]
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum DataKey {
+    Quest(u32),
+    Submission(Address, u32), // (Submitter Address, Quest ID)
+    Token,
+}