Add Step-by-step installation guide for advanced users and non-listed browsers

Step-by-step installation guide for advanced users and non-listed browsers.-.md

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+## Step 1
+
+Start by downloading the latest zip file [from here](https://www.cookie-dialog-monster.com/releases/latest.zip).
+
+## Step 2
+
+Extract the downloaded zip file to a location on your local machine.
+
+## Step 3
+
+Open your browser's extensions page:
+
+   - For Chrome, navigate to [chrome://extensions](chrome://extensions)
+   - For Firefox, navigate to [about:addons](about:addons)
+   - For Edge, navigate to [edge://extensions](edge://extensions)
+
+## Step 4
+
+Enable **Developer mode** (usually a toggle switch in the top right corner of the extensions page).
+
+## Step 5
+
+Click on the **Load unpacked** button.
+
+## Step 6
+
+A file dialog will open. Navigate to and select the extracted folder (or `manifest.json` file inside this folder if needed).
+
+## Step 7
+
+Congratulations! You've successfully loaded the latest build of this extension.