Created model queries outlines

related to #19

src/model/acceptChallenge.js

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+// Accepted Challenges

src/model/completeChallenge.js

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+// completeChallenges

src/model/getAcceptedChallenges.js

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+// getAccepetedChallenges

src/model/getChallenges.js

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+const dbConnection = require('../../db/db_connection'); 
+
+module.exports = () => 
+    new Promise((resolve,reject) => {
+        dbConnection.query(
+            `SELECT * FROM challenges`,
+        (err,res) =>{
+            if (err) return reject(err);
+            resolve(res);
+        }
+    )
+    });

src/model/getCompletedChallenges.js

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+// getCompletedChalllenges

src/model/index.js

@@ -1 +1,14 @@
-// booo index.js
+// booo index.js
+const acceptChallenge = require('./acceptChallenge')
+const completeChallenge = require('./completeChallenge')
+const getAcceptedChallenges = require('./getAcceptedChallenges')
+const getChallenges = require('./getChallenges')
+const getCompletedChallenges = require ('./getCompletedChallenges')
+
+module.exports = {
+    acceptChallenge,
+    completeChallenge,
+    getAcceptedChallenges,
+    getChallenges,
+    getCompletedChallenges
+}

test/queries.test.js

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+// go tests
+const dbConnection = require('../db/db_connection'); 
+const challengeDetails = require('../src/model/challengeDetail')
+
+describe('Can select all from challenges', done =>{
+    dbConnection().then(
+        challengeDetails
+    )
+})
+