docs: updating wording in readme.md (#396)

* docs: updating wording in readme.md

* docs: adding container otherwise misleading

README.md

@@ -117,13 +117,13 @@ You will need to uncheck "Use Rosetta for x86_64/amd64 emulation on Apple Silico
 #### 1. Modify config files
 In the root of the project, use `cp` command to create `.env` from the [ .env.example ](https://github.com/TEN-framework/ten-agent/blob/main/.env.example).
 
-It will be used to store environment variables for `docker compose` later, and if you change it, you will need to `source .env` again for the changes to take effect.
+It will be used to store environment variables for `docker compose` later, and if you change it, you will need to `source .env` again in the container for the changes to take effect.
 ```bash
 cp ./.env.example ./.env
 ```
 
 #### 2. Setup API keys
-Open the `.env` file and fill in the `keys`.
+Open the `.env` file and fill in the `keys`. We recommend using [ Deepgram ASR ](https://deepgram.com/) and [ FishAudio TTS ](https://fish.audio/) as they are free to sign up for and offer free credits. Of course, you can also use other services, see the list in [.env.example](https://github.com/TEN-framework/ten-agent/blob/main/.env.example).
 ```bash
 # Agora App ID 
 # Agora App Certificate(only required if enabled in the Agora Console)