[Finishes #60] Create 2 empty pages for Mission and Vision

# Story Title

[Create 2 empty pages for Mission and Vision](#60)

# Changes made

- Create Mission page
- Create Vision page

# How does the solution address the problem

This PR will add 2 pages for Mission and Vision.

pages/mission.tsx

@@ -0,0 +1,5 @@
+function MissionPage() {
+  return <div>Mission Page</div>
+}
+
+export default MissionPage

pages/vision.tsx

@@ -0,0 +1,5 @@
+function VisionPage() {
+  return <div>Vision Page</div>
+}
+
+export default VisionPage