Update README.md

README.md

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-# AI Composer
+# 1. Installation
+### Step 1: Get Gemini API key:
+- [**Google AI Studio**](https://aistudio.google.com/app/apikey) (Google signin may be required)
+### Step 2: Set the API key as a environment variable:
+Run below command on the Windows Terminal:
+```
+setx GEMINI_API_KEY AIzaSyDTxv-----------------------------
+```
+Replace "*AIzaSyDTxv-----------------------------*" with your API key.
+### Step 3: Download and run:
+- Download the installer HERE and follow its guidance.
+- Restart your Microsoft Word.
+# 2. Usage
+- Select some text in your document as the context for the AI Composer to understand.
+- Right click, select **AI Composer** and wait for seconds.
+
+![image](https://i.imgur.com/rQX0MAq.png)