Add function to get the todo for the specified user

src/functions/getUserTodo.ts

@@ -0,0 +1,31 @@
+import { APIGatewayProxyHandler } from "aws-lambda"
+import { document } from '../utils/dynamodbClient'
+
+export const handler: APIGatewayProxyHandler = async (event) => {
+    const { userId } = event.pathParameters
+
+    const response = await document
+    .query({
+        TableName: 'usersTodos',
+        KeyConditionExpression: 'userId = :userId',
+        ExpressionAttributeValues: {
+            ':userId': userId
+        }
+    }).promise()
+
+    if(response.Items.length === 0) {
+        return {
+            statusCode: 201,
+            body: JSON.stringify({
+                message: 'No todos found for specified user!'
+            })
+        }
+    }
+
+    return {
+        statusCode: 201,
+        body: JSON.stringify({
+            todos: response.Items
+        })
+    }
+}