add a bit of docs

.env.example

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+# Make sure this database is PostgreSQL, otherwise you will run into errors.
+DATABASE_URL=postgresql://your-user:your-password@your-server:5432/your-db
+
+# We recommend using a service like mailgun, but you could use gmail or AWS SES.
+SMTP_SERVER=smtp.example.com
+SMTP_USER=no-reply@example.com
+SMTP_PASS=your-password-here
+
+# Change this if you need different bindings.
+ROCKET_ADDRESS=0.0.0.0
+ROCKET_PORT=8000
+
+# AWS S3 is recommended but MinIO is also a choice.
+S3_URL=https://minio.example.com:9000/
+S3_USER=user
+S3_PASSWD=password
+S3_BUCKET=account-rs
+
+# Make sure to put a secure AES key here as this encrypts all tokens.
+ACCOUNT_AES_KEY=abcdef0123456789abcdef0123456789
+
+# You'll only be using gRPC if you're using Pretendo code but it's still recommended to set something secure here.
+GRPC_PASSWORD=123456
+

README.md

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+# account.rs
+
+Reimplementation of the Nintendo Network Account System (NNAS) in Rust.
+
+# Requirements
+
+- Rust (rustup recommended)
+- A PostgreSQL database
+- An S3 bucket
+- An SMTP server
+
+For more info on configuring the server, check the .env.example file, it has comments that should help.
+
+# Building
+
+This step shouldn't be required once we start making official releases, but for now you need to build it yourself.
+You will need to set your database's connection URL in the environment variable DATABASE_URL with `export`. Without it, the server will not build.
+
+```bash
+export DATABASE_URL=postgresql://your-user:your-password@your-postgresql-server:5432/your-db
+```
+
+Once you have that set up, you should just be able to run `cargo build` and it will build to `target/account-server-rust`.
+