feat: allow css configuration from package.json or config file

documentation/markdown/README.md

@@ -34,6 +34,7 @@ the [changelog](https://github.com/CommunitySolidServer/CommunitySolidServer/blo
 * [How to use the Identity Provider](usage/identity-provider.md)
 * [How to automate authentication](usage/client-credentials.md)
 * [How to automatically seed pods on startup](usage/seeding-pods.md)
+* [Using the CSS as a development server in another project](usage/dev-configuration.md)
 
 ## What the internals look like
 

documentation/markdown/usage/dev-configuration.md

@@ -0,0 +1,49 @@
+# Configuring the CSS as a development server in another project
+
+It can be useful to use the CSS as local server to develop Solid applications against.
+As an alternative to using CLI arguments, or environment variables, the CSS can be configured in the `package.json` as follows:
+
+```json
+{
+  "name": "test",
+  "version": "0.0.0",
+  "private": "true",
+  "config": {
+    "community-solid-server": {
+      "port": 3001,
+      "loggingLevel": "error"
+    }
+  },
+  "scripts": {
+    "dev:pod": "community-solid-server"
+  },
+  "devDependencies": {
+    "@solid/community-server": "^6.0.0"
+  }
+}
+```
+
+These parameters will then be used when the `community-solid-server`
+command is executed as an npm script (as shown in the example above).
+Or whenever the `community-solid-server` command is executed in the same
+folder as the `package.json`.
+
+Alternatively, the configuration parameters may be placed in a configuration file named
+`.community-solid-server.config.json` as follows:
+
+```json
+{
+  "port": 3001,
+  "loggingLevel": "error"
+}
+```
+
+The config may also be written in JavaScript with the config as the default export
+such as the following `.community-solid-server.config.js`:
+
+```js
+module.exports = {
+  port: 3001,
+  loggingLevel: "error"
+};
+```