Add env files

samples/msteams-FAQPlus/env/.env.dev.user

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+# This file includes environment variables that will not be committed to git by default. 
+# Secrets. Keys prefixed with `SECRET_` will be masked in Teams Toolkit logs.
+
+# This is automatically updated.
+SECRET_BOT_PASSWORD=
+TEAMS_APP_UPDATE_TIME=
+
+# Provide the channel id
+TEAMS_CHANNEL_ID=
+
+# Provide the following key/endpoints.
+SECRET_AZURE_OPENAI_KEY=
+SECRET_AZURE_OPENAI_ENDPOINT=
+SECRET_AZURE_SEARCH_ENDPOINT=
+SECRET_AZURE_SEARCH_KEY=
+
+AZURE_SEARCH_INDEX=faq-index
+AZURE_OPENAI_MODEL=gpt-4o

samples/msteams-FAQPlus/env/.env.local

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+TEAMSFX_ENV=local
+APP_NAME_SUFFIX=local
+
+# Generated during provision, you can also add your own variables.
+BOT_ID=
+TEAMS_APP_ID=
+BOT_DOMAIN=
+BOT_ENDPOINT=
+TEAMS_APP_TENANT_ID=

samples/msteams-FAQPlus/env/.env.local.user

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+# This file includes environment variables that will not be committed to git by default. 
+# Secrets. Keys prefixed with `SECRET_` will be masked in Teams Toolkit logs. 
+
+# This is automatically updated.
+SECRET_BOT_PASSWORD=
+TEAMS_APP_UPDATE_TIME=
+
+# Provide the channel id
+TEAMS_CHANNEL_ID=
+
+# Provide the following key/endpoints.
+SECRET_AZURE_OPENAI_KEY=
+SECRET_AZURE_OPENAI_ENDPOINT=
+SECRET_AZURE_SEARCH_ENDPOINT=
+SECRET_AZURE_SEARCH_KEY=
+
+AZURE_SEARCH_INDEX=faq-index
+AZURE_OPENAI_MODEL=gpt-4o