project: add cow icon to readme

README.md

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-### Simple Twitch Emote Sounds
+### 🐮 Simple Twitch Emote Sounds
 
 This application was created as a simple, easy-to-use, quick to set up, sound trigger. The goal is to reduce the barrier of entry and enable creators to add an Emote Sound within seconds, instead of the minute(s)-long process with current mainstream options like MixItUp and Streamer.bot.