Set up jest with babel. Add failing test to see if it passes CI

spec/javascript/hello_jest.spec.js

@@ -0,0 +1,15 @@
+import Jester from "jester"
+
+describe('this test should pass', () => {
+  test('very first test', () => {
+    expect(true).toBe(true)
+  })
+
+  test('Jester.hello returns greeting', () =>{
+    const jester = new Jester()
+    expect(jester.hello()).toBe("Hello")
+  })
+  test('fail', () => {
+    expect(false).toBe(true)
+  })
+})