add notes to README.md for build, install and testing

src/python/README.md

@@ -44,6 +44,8 @@ interface.
 To do that, it provides the functions _utcoffset_, _dst_ and _tzname_.
 It inherits the _fromutc_ function from tzinfo.
 
+If the library is installed from source code from GitHub, use the Python flit command to build and install. It can be built with "flit built" and installed with "flit install".
+
 Online resources
 ----------------
 

src/python/timezone_solar/README.md

@@ -5,7 +5,7 @@ Source files:
 * __init__.py - initialization for sources in timezone_solar module directory, loads the module
 * timezone_solar.py - core of the timezone_solar module
 * tzsconst.py - constants used by the timezone_solar module and its unit tests
-* test (directory) - containts unit tests
+* test (directory) - containts unit tests (to run tests, use the command line "python tests")
   * __main__.py - allows running all the tests by running the test module/directory as a Python script
   * test_010_tzsconst.py - unit tests for constants in tzsconst
   * test_011_basic.py - basic unit tests of timezone_solar time zones for each longitude or hourly zone