Expand README

README.md

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+Minecraft Server Invites [mc.gmem.ca](https://mc.gmem.ca)
+===
+
+**Generate Discord-like invites for your Minecraft server**
+
+![Homepage screenshot](homepage.png)
+
+_Looking for the frontend? See here: https://git.sr.ht/~gmem/minecraft-server-invites-frontend_
+
+## Building
+
+```shell
+# Docker
+docker build . -t whitelistmanager
+# Non-docker
+go build -o wlm -ldflags "-s -w"
+```
+
+## Running
+
+This project aims to be as dependency free as possible. The SQLite database will be automatically
+created on first run.
+
+[You will need to generate the keys for the Microsoft OAuth flow by following this guide](https://docs.microsoft.com/en-us/azure/active-directory/develop/quickstart-register-app).
+
+The keys can then be saved to environment variables as follows:
+
+```shell
+AZURE_OAUTH_CLIENT_ID=<client id>
+AZURE_OAUTH_CLIENT_SECRET=<client secret>
+AZURE_OAUTH_CLIENT_SECRET_ID=<client secret id> # technically unused at the moment
+```
+
+```shell
+# Docker
+docker run whitelistmanager
+# Non-docker
+go run ./...
+```