Add a section on results and logging config. Fixes #950

docs/core/usage.qmd

@@ -70,6 +70,25 @@ Currently there are the following allocation settings:
 - `use_allocation`: A boolean which says whether allocation should be used or not;
 - `timestep`: a float value in seconds which dictates the update interval for allocations.
 
+## Results settings
+
+The following entries can be set in the configuration in the `[results]` section.
+
+entry             | type   | description
+----------------- | ------ | -----------
+compression       | String | Compression algorithm: zstd or lz4.
+compression_level | Int    | Compression level. Higher is more compression.
+subgrid           | Bool   | Compute and output more detailed water levels.
+
+## Logging settings
+
+The following entries can be set in the configuration in the `[logging]` section.
+
+entry             | type   | description
+----------------- | ------ | -----------
+verbosity         | String | Verbosity level: debug, info, warn, or error.
+timing            | Bool   | Enable timings.
+
 # GeoPackage database and Arrow tables
 
 The input and output tables described below all share that they are tabular files. The Node