Update README.md

Author: rumi-chan

README.md

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 # Irelia-Theme
 Spirit Blossom Irelia theme for League of Legends client.
+# How to install?
+-  Using this tool https://github.com/nomi-san/league-loader/
+-  Put rumi.js and rumi.theme.css into plugins Folder
+- Enjoy!
+
+![League of Legends 1_15_2023 9_15_23 PM](https://user-images.githubusercontent.com/59478113/212546987-b21ebd93-8cad-4c23-a444-521647f3e6fa.png)