Documented database configuration.

README.md

@@ -28,6 +28,18 @@ After cloning the repository, call
 
 to initialize the `paket` configuration.
 
+### Database Configuration
+
+Both the application itself and the tests require that the database connection
+is configured properly. For this,
+
+* copy `src/LogicalHacking.ExtensionDsLab/app.config.in`
+  to `src/LogicalHacking.ExtensionDsLab/app.config  
+* edit `src/LogicalHacking.ExtensionDsLab/app.config` and
+  replace in the connection string the correct values for `<SERVER>`,
+  `<LOGIN>`, and `<PWD`>.
+* repeat the previous steps for `src/LogicalHacking.ExtensionDsLab.Tests/app.config.in` .
+
 ### (Re-) Compiling
 
 After that, the project can be build using