feat: add Calendar component to main app screen with fixed height and empty events list

Author: acro5piano

DemoApp/app/index.tsx

@@ -1,4 +1,5 @@
 import { Text, View } from 'react-native'
+import { Calendar } from './react-native-big-calendar/build'
 
 export default function Index() {
   return (
@@ -10,6 +11,7 @@ export default function Index() {
       }}
     >
       <Text>Edit app/index.tsx to edit this screen.</Text>
+      <Calendar height={600} events={[]} />
     </View>
   )
 }