fix(config): added jest configuration file

Author: lemon-mario

configs/jest.config.js

@@ -0,0 +1,11 @@
+module.exports = {
+  coverageDirectory: "./coverage/",
+  collectCoverage: true,
+  transform: {
+    ".(ts|js)": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+  },
+  testEnvironment: "node",
+  bail: true,
+  moduleFileExtensions: ["ts", "js"],
+  testMatch: ["<rootDir>/src/**/*.(test|spec).(ts|js)"]
+};