Add OpenAI function appsettings (Azure-Samples#215)

## Purpose
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does it solve or functionality does it add? -->
* ...

## Does this introduce a breaking change?
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[ ] Yes
[ ] No
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## Pull Request Type
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[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:
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## How to Test
*  Get the code

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git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install
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* Test the code
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```

## What to Check
Verify that the following are valid
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## Other Information
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infra/main.bicep

@@ -302,6 +302,8 @@ module function './app/function.bicep' = {
       AZURE_SEARCH_SERVICE_ENDPOINT: searchService.outputs.endpoint
       AZURE_SEARCH_INDEX: searchIndexName
       AZURE_STORAGE_BLOB_ENDPOINT: storage.outputs.primaryEndpoints.blob
+      AZURE_OPENAI_EMBEDDING_DEPLOYMENT: embeddingModelName
+      AZURE_OPENAI_ENDPOINT: openAi.outputs.endpoint      
     }
   }
 }