readme: notes on config file and fg/bg run mode

README.md

@@ -187,6 +187,24 @@ Dependencies: Doxygen 1.8.0 or later, Graphviz 2.28 or later (optional).
 * If you have installed Graphviz, you can also generate in-doc diagrams by instead running `HAVE_DOT=YES doxygen Doxyfile`
 * The output will be built in doc/html/
 
+## Running bitmonerod
+
+The build places the binary in `bin/` sub-directory within the build directory
+from which cmake was invoked (repository root by default). To run in
+foreground:
+
+    ./bin/bitmonerod
+
+To run in background:
+
+    ./bin/bitmonerod --log-file bitmonerod.log --detach
+
+To list all available options, run `./bin/bitmonerod --help`.  Options can be
+specified either on the command line or in a configuration file passed by the
+`--config-file` argument.  To specify an option in the configuration file, add
+a line with the syntax `argumentname=value`, where `argumentname` is the name
+of the argument without any dashes, for example `log-level=1`.
+
 ## Internationalization
 
 See README.i18n