Added types/interfaces

src/enums/nodeTypes.ts

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+enum NodeTypes {
+    type,
+    fill,
+    match,
+}

src/interfaces/Exercise.ts

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+interface Exercise {
+    id: number,
+    type: NodeTypes,
+    content: string // as json
+}

src/interfaces/Path.ts

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+interface Path {
+    id: number,
+    title: string,
+    description: string,
+    nodes: Node[],
+    metadata: {
+        versions: string[],
+        createdAt: Date,
+        updatedAt: Date,
+    }
+}

src/interfaces/PathNode.ts

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+interface Node {
+    id: number,
+    title: string,
+    description: string,
+
+}

src/interfaces/Progress.ts

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+interface Progress {
+    pathId: number,
+    nodeId: number,
+    exerciseId: number,
+    localVersion: number,
+}