clarify/tweak instructions and wording

README.md

@@ -116,12 +116,11 @@ pip install -r requirements.txt
 ```
 
 5. Locate the file named `.env.template` in the main `/Auto-GPT` folder.
-   Open the `.env.template` file in a text editor.
+   Create a copy of this file, called `.env` by removing the `template` extension.  The easiest way is to do this in a command prompt/terminal window `cp .env.template .env`
+   Open the `.env` file in a text editor.  Note: Files starting with a dot might be hidden by your Operating System.
    Find the line that says `OPENAI_API_KEY=`.
    After the `"="`, enter your unique OpenAI API Key (without any quotes or spaces).
    Enter any other API keys or Tokens for services you would like to utilize.
-   Rename this file to `.env` by removing the `.template` extension.
-   Use the `"Save as.."` option and chose `"No Extension"` from the "`Save as type:"` dropdown menu below the file name. 
    Save and close the `".env"` file.
    By completing these steps, you have properly configured the API Keys for your project.