add mock keystore

squarenotsquare/__mock__/mockKeyStore.js

@@ -0,0 +1,11 @@
+export async function removeKey(key) {
+    return true;
+}
+
+export async function setKey(key, value) {
+    return true;
+}
+
+export async function getKey(key) {
+  return '1234567890';
+}