Fix Doxygen warnings: document the source only, with a main page

Refs #17

Doxyfile

@@ -1,20 +1,19 @@
-# Doxygen configuration for the squirrel census project.
+# Doxygen configuration for the squirrel census project.
-# Build the source documentation with: doxygen Doxyfile
+# Build the source documentation with: doxygen Doxyfile
-# Output goes to docs/doxygen/ (ignored by git). Everything not listed here
+# Output goes to docs/doxygen/ (ignored by git). Everything not listed here
-# keeps the Doxygen default.
+# keeps the Doxygen default.
-
+
-PROJECT_NAME           = "Squirrel Census"
+PROJECT_NAME           = "Squirrel Census"
-PROJECT_BRIEF          = "Count squirrels by primary fur colour"
+PROJECT_BRIEF          = "Count squirrels by primary fur colour"
-PROJECT_NUMBER         = 0.1.0
+PROJECT_NUMBER         = 0.1.0
-OUTPUT_DIRECTORY       = docs/doxygen
+OUTPUT_DIRECTORY       = docs/doxygen
-INPUT                  = src README.md
+INPUT                  = src docs/mainpage.dox
-FILE_PATTERNS          = *.py *.md
+FILE_PATTERNS          = *.py *.dox
-RECURSIVE              = YES
+RECURSIVE              = YES
-USE_MDFILE_AS_MAINPAGE = README.md
+OPTIMIZE_OUTPUT_JAVA   = YES
-OPTIMIZE_OUTPUT_JAVA   = YES
+EXTRACT_ALL            = YES
-EXTRACT_ALL            = YES
+GENERATE_HTML          = YES
-GENERATE_HTML          = YES
+GENERATE_LATEX         = NO
-GENERATE_LATEX         = NO
+QUIET                  = YES
-QUIET                  = YES
+WARN_IF_UNDOCUMENTED   = YES
-WARN_IF_UNDOCUMENTED   = YES
+WARN_AS_ERROR          = NO
-WARN_AS_ERROR          = NO

docs/mainpage.dox

@@ -0,0 +1,13 @@
+/**
+@mainpage Squirrel Census
+
+Count the squirrels of the 2018 Central Park Squirrel Census by primary fur colour
+(Gray, Cinnamon, Black) and export the counts to `squirrel_count.csv`.
+
+The steps follow the Udemy "100 Days of Code" lecture of day 25: squirrel.census.read_csv,
+squirrel.census.count_by_fur_color, squirrel.census.build_summary and
+squirrel.census.write_csv. The command line entry point is squirrel.cli.main, started
+with `python -m squirrel`. Every literal is defined once in squirrel.constants.
+
+The package uses only the Python standard library.
+*/