add favicon instruction (#5)

Adding the docs for adding Favicons

Author: Ubayed-Bin-Sufian

docs/Adding_favicon.md

@@ -0,0 +1,25 @@
+# Adding a Favicon
+
+## Steps to Add a New Favicon
+
+1. **Prepare the Favicon File:**
+   - Create an SVG (preferred) or PNG file for the favicon.
+   - Ensure the favicon design aligns with the existing ones.
+
+2. **Place the Favicon in the Correct Directory:**
+   - Move the favicon file to the `public/favicons/` folder.
+
+3. **Update the Favicon List:**
+   - Open the `public/Randomfavicon.js` file.
+   - Locate the `const favicons` array.
+   - Add the filename to the array, e.g., `'filename.svg'`.
+
+## Modifying the Colors of Existing Favicons
+
+If you need to update the colors of an existing favicon, edit the SVG file and update the hex codes in the following places:
+
+- `flood-color="#00FFFF"`
+- `fill="#40C0E7"`
+- `stroke="#00FFFF"`
+
+Ensure that the new colors remain consistent with the current favicon theme.