add README

reactions/README.md

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+# discord-reactions
+
+just a small script to automatically react to discord messages from a specific user
+
+## instructions
+213690950524993536
+```
+1. Get Discord Token [Official Instructions](https://discordhelp.net/discord-token)
+2. Add copied value as TOKEN to script
+3. Fill in target information:
+ - `target_name`: Name of Message Sender
+ - `target_disc`: Discriminator of Message Sender (4-digit number behind hashtag) 
+ - `guild_id`: ID of the server
+ - `channel_id`: ID of the channel
+ - `emojinames`: Names of all emojis
+5. Run `python3 main.py`
+```