add configuration resolution order section

Author: louiswesterheide

docs/automate/cmemc-command-line-interface/configuration/index.md

@@ -38,3 +38,18 @@ In order to work with cmemc, you have to configure it according to your needs.
     In addition to that, cmemc can work with [custom certificates](certificate-handling-and-ssl-verification/index.md).
 
 </div>
+
+## Configuration value resolution order
+
+When the same key is defined in multiple places, cmemc resolves values in the following order:
+
+1. **Named connection section** — When you run cmemc with a specific connection (e.g. `-c my-connection`),
+all keys from the corresponding `[my-connection]` section are used. This takes full precedence,
+including over OS environment variables, so you can define self-contained, reproducible
+connection profiles that are not affected by your shell environment.
+
+2. **OS environment variables** — If a key is set as an environment variable and no named connection
+section is active, the environment variable value is used.
+
+3. **`[DEFAULT]` section** — The `[DEFAULT]` section in `~/.config/cmemc/cmemc.ini` acts as a fallback
+for all connections. Its values are ignored if the same key is already set as an environment variable.