Update docs

README.md

@@ -118,6 +118,7 @@ For all:
 For instance administrators:
 - [Reverse proxy: Nginx](docs/reverse_proxy_nginx.md)
 - [Database: PostgreSQL](docs/db_postgresql.md)
+- [Rate limiting](docs/ratelimits.md)
 - [Make Lenpaste server private](docs/private_server.md)
 
 For developers:

docs/ratelimits.md

@@ -0,0 +1,11 @@
+# Rate limiting
+Rate limits protect your server from abuse.
+The default settings are optimal.
+**Don't change default settings if you don't understand what you're doing.**
+
+Each individual IP address has its own rate limit.
+Also the rate limits of different actions do not depend on each other.
+
+| Acts on             | Measured in              | Default | Docker variable                | CLI flag              |
+|---------------------|--------------------------|---------|--------------------------------|-----------------------|
+| New paste creation. | New pastes per 5 minute. | `15`    | `LENPASTE_NEW_PASTES_PER_5MIN` | `-new-pastes-per-5min`|