Create README.md

Telegram.org/Väinämöinen/README.md

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+# Telegram semi-automatic group mass DM sender
+
+*We are not responsible for any issues such as damages or losses caused by the userscript.*
+
+# Usage
+
+1. Open a group chat with a member list visible. The group needs to have public members.
+2. Write your message to the floating Väinämöinen window.
+3. Start, then choose to send (ENTER) or to skip (SPACEBAR) the message.
+
+**NOTE: Do not navigate the Telegram site yourself during this process. Do not spam keybinds or buttons.**
+
+# Additional
+
+This was a quickly made project. If you plan on using it, you might want to request me to improve it a bit.