Expand README

README.md

@@ -7,6 +7,25 @@ Minecraft Server Invites [mc.gmem.ca](https://mc.gmem.ca)
 
 _Looking for the frontend? See here: https://git.sr.ht/~gmem/minecraft-server-invites-frontend_
 
+## About
+
+Sometimes you want to allow people to play on your Minecraft server, but you don't necessarily want to
+go through the whole process of asking for their username, then manually sending the command to add them
+to the whitelist*. Instead, this application offers the ability to generate a short link that directs
+a user through an OAuth flow to automatically fetch their Minecraft account (assuming the account has been
+migrated - I have no plans at this time to support non-migrated accounts, despite how I may personally feel
+about them) and send a command over RCON to your server to add them to the whitelist. It will then give them
+the address to connect to the server.
+
+This is currently hosted at [mc.gmem.ca](https://mc.gmem.ca) while being developed. It's currently free, and
+while I do want to eventually monetize this hosted version, you are more than welcome to host your own instance
+(this is actually recommended if you have the ability, since it allows you to keep RCON private). I do
+happily [accept donations](https://www.buymeacoffee.com/gmem) though!
+
+*while the term "whitelist" is by and large being replaced in places, this is still the term Minecraft servers
+utilise, and is therefore the term used in this application. Should it be changed, use of the term here will
+also be changed.
+
 ## Building
 
 ```shell