[FEATURE] Add markdown file to document test case flows (microsoft#392)

Co-authored-by: Ian Seabock (Centific Technologies Inc) <[email protected]>

TEST_CASE_FLOWS.md

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+# Introduction
+Below are some flows to follow to make sure code changes are tested effectivly and efficiently. 
+The goal is to make sure that this is repeatable and can be done by anyone to avoid regressions.
+
+## Test Case Flows
+- with data, streaming
+- with data, non streaming
+- without data, streaming
+- without data, non streaming
+- All of the above with and without chat history
+
+### With Data, Streaming
+The following environment variables are required to run this test case:
+
+`AZURE_SEARCH_SERVICE`\
+`AZURE_SEARCH_INDEX`\
+`AZURE_SEARCH_KEY`
+
+`AZURE_OPENAI_STREAM` should be set to `true`
+
+### With Data, Streaming, Chat History
+Keep the same environment variables as above, but add the following:
+
+`AZURE_COSMOSDB_DATABASE`\
+`AZURE_COSMOSDB_ACCOUNT`\
+`AZURE_COSMOSDB_CONVERSATIONS_CONTAINER`\
+`AZURE_COSMOSDB_ACCOUNT_KEY`
+
+### With Data, Nonstreaming
+The following environment variables are required to run this test case:
+`AZURE_SEARCH_SERVICE`\
+`AZURE_SEARCH_INDEX`\
+`AZURE_SEARCH_KEY`
+
+`AZURE_OPENAI_STREAM` should be set to `false`
+
+### With Data, Nonstreaming, Chat History
+Keep the same environment variables as above, but add the following:
+
+`AZURE_COSMOSDB_DATABASE`\
+`AZURE_COSMOSDB_ACCOUNT`\
+`AZURE_COSMOSDB_CONVERSATIONS_CONTAINER`\
+`AZURE_COSMOSDB_ACCOUNT_KEY`
+
+### Without Data, Streaming
+The following environment variables should **not** be set:
+
+`AZURE_SEARCH_SERVICE`\
+`AZURE_SEARCH_INDEX`\
+`AZURE_SEARCH_KEY`
+
+`AZURE_OPENAI_STREAM` should be set to `true`
+
+### Without Data, Streaming, Chat History
+Keep the same environment variables as above, but add the following:
+
+`AZURE_COSMOSDB_DATABASE`\
+`AZURE_COSMOSDB_ACCOUNT`\
+`AZURE_COSMOSDB_CONVERSATIONS_CONTAINER`\
+`AZURE_COSMOSDB_ACCOUNT_KEY`
+
+### Without Data, Nonstreaming
+The following environment variables should **not** be set:
+
+`AZURE_SEARCH_SERVICE`\
+`AZURE_SEARCH_INDEX`\
+`AZURE_SEARCH_KEY`
+
+`AZURE_OPENAI_STREAM` should be set to `false`
+
+### Without Data, Nonstreaming, Chat History
+Keep the same environment variables as above, but add the following:
+
+`AZURE_COSMOSDB_DATABASE`\
+`AZURE_COSMOSDB_ACCOUNT`\
+`AZURE_COSMOSDB_CONVERSATIONS_CONTAINER`\
+`AZURE_COSMOSDB_ACCOUNT_KEY`