added readme

README.md

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+# Mosquito Swatter
+
+A minesweeper clone for discord but instead of mines, you'll get stung by a mosquito.
+
+# Invite link
+
+[Add to your server](https://discord.com/oauth2/authorize?client_id=1212506405240836199&scope=bot)
+
+The bot does not require any permissions aside from "create slash commands"
+
+# Usage
+
+In any channel to bot has access to use the `/mosquitoswatter` command
+
+# Options
+
+  - `width` Width of the board, between 3 and 11 (default: 11)
+  - `height` Height of the board, between 3 and 9 (default: 9)
+  - `mosquitos` Amount of mosquitos, between 1 and (width*height-1) (default: 10)
+  - `private` Reply with a message only you can see (default: true)
+
+# FAQ:
+
+Q: The board is completely revealed when I issue the command!
+
+A: The bot makes use of discords spoiler tags, make sure they don't auto-reveal in "User Settings -> Chat -> Show Spoiler Content"