chore(README): Documentation

README.md

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+# **Instant chan**
+
+### **Add to your server**
+
+First you need the bot on your server:
+
+Invite the bot with [this url](https://discord.com/api/oauth2/authorize?client_id=717139997186326609&permissions=16778256&scope=bot)
+
+> You doesn't need to add some extra permissions.
+
+### **Bind a vocal channel**
+
+1) To transform one vocal channel to a "channel duplicator", you must have his ID (eg. 719539555653346610).
+
+> Check this [guide](https://support.discord.com/hc/en-us/articles/206346498-Where-can-I-find-my-User-Server-Message-ID-) to find the vocal channel ID
+
+2) Provide this ID to `instant-chan` by command:
+```bash
+!instant bind 719539555653346610 # Replace by your channel ID
+```
+
+> User must have "Manage channel" permission to achieve this command
+
+3) You're done ! Now your channel must have `... (new)` suffix. Users can create their own channels duplicas.
+
+### **Support**
+
+Contact `Gabouchet#0497` on our support server [discord servers](https://discord.gg/p29wzsQXxJ)