Add Placeholder for Recommendation Index Page

[jcucsb]

• [x] There is a file called 'RecommendationRequestsIndexPage.js' in the 'src/main/pages/RecommendationRequests' directory.
• [x] The file exports a component with a basic layout, a title 'RecommendationRequests', and placeholder text.
• [x] In 'App.js', there is a route linking the path '/RecommendationRequests/list' to 'RecommendationRequestsPage'

[jcucsb]

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