added handler for login

backend/utils/constants.js

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+const colors = ["red", "blue", "green", "yellow"];
+module.exports = { colors };

backend/utils/functions.js

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+const { colors } = require("./constants");
+function getStartPositions() {
+  const startPositions = [];
+  for (let i = 0; i < 16; i++) {
+    let pawn = {};
+    pawn.basePos = i;
+    pawn.position = i;
+    if (i < 4) pawn.color = colors[0];
+    else if (i < 8) pawn.color = colors[1];
+    else if (i < 12) pawn.color = colors[2];
+    else if (i < 16) pawn.color = colors[3];
+    startPositions.push(pawn);
+  }
+  return startPositions;
+}
+module.exports = { getStartPositions };