Add rate limiting explanation to readme

README.md

@@ -10,7 +10,7 @@ Micro-service for file storage and processing written in Go.
 ## Requirements
 
 - [Go 1.17+](https://go.dev/)
-- [*Docker*](https://docs.docker.com/) (optional)
+- [_Docker_](https://docs.docker.com/) (optional)
 
 ## Setup
 
@@ -56,13 +56,43 @@ go test ./... -v
 docker run --rm -v "$PWD":/usr/src/lithium -w /usr/src/lithium golang:1.17 go test ./...
 ```
 
+## Configuration
+
+Config options can be adjusted via the [`settings.json`](settings.json) file in the root directory.
+
+```json
+{
+  "endpoint": "0.0.0.0:8000",
+  "token": "changeme",
+  "rate_limiter": {
+    "requests_per_minute": 20,
+    "allowed_burst": 5
+  },
+  "storage_provider": {
+    "type": 0,
+    "base_path": "assets"
+  }
+}
+```
+
+## Rate Limiting
+
+By default, the rate limiting takes place on a per-route basis. When the limit for a specific route is hit, the response will return a status code `429: Too Many Requests`.
+
+| Headers               | Explanation                      |
+| --------------------- | -------------------------------- |
+| X-Ratelimit-Limit     | Allowed requests per minute      |
+| X-Ratelimit-Remaining | Remaining requests               |
+| X-Ratelimit-Reset     | Seconds until requests replenish |
+
 ## API
 
 ### `GET` `/`
 
-Show application information. 
+Show application information.
 
 **Required headers**:
+
 ```shell
 Authorization: Bearer <Token>
 ```
@@ -81,6 +111,7 @@ Authorization: Bearer <Token>
 Show pipeline information.
 
 **Required headers**:
+
 ```shell
 Authorization: Bearer <Token>
 ```
@@ -111,27 +142,12 @@ Authorization: Bearer <Token>
 }
 ```
 
-## Configuration
-
-Config options can be adjusted via the [`settings.json`](settings.json) file in the root directory.
-
-```json
-{
-  "endpoint": "0.0.0.0:8000",
-  "token": "changeme",
-  "storage_provider": {
-    "type": 0,
-    "base_path": "assets"
-  }
-}
-```
-
 ## Pipelines
 
 The project uses a pipeline system defined by [JSON](https://en.wikipedia.org/wiki/JSON) files located in the [config](config) folder.
 Take a look at the [example pipeline configuration file](config/example.json).
 
-Available pipeline `type`s:  `0` (Image), `1` (Video)
+Available pipeline `type`s: `0` (Image), `1` (Video)
 
 ```json
 {
@@ -148,7 +164,7 @@ Available pipeline `type`s:  `0` (Image), `1` (Video)
 
 The image pipeline offers the following additional output options.
 
-Available `format` types: `jpg` (or `jpeg`), `png`, `gif`, `tif` (or `tiff`) and `bmp`      
+Available `format` types: `jpg` (or `jpeg`), `png`, `gif`, `tif` (or `tiff`) and `bmp`  
 The `quality` field can contain any integer between 1 and 100.
 
 ```json