Add basic documentation

API.md

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+TO BE WRITTEN

README.md

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+# Calendar
+
+This mod adds a simple and customizable calender system.
+
+The calendar supports days, weeks, months and years.
+Holidays are also supported.
+
+By default, a year has 12 months with 30 days each, with a total of 360 days.
+
+## Info for programmers
+See `API.md`.
+
+## Where is the date stored?
+Minetest stores the number of elapsed days in the world files and it
+can be queried in Lua via `minetest.get_day_count()`.
+The day count is stored in the world directory under `env_meta.txt` as
+`day_count`.

mod.conf

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+name = calendar
+description = A simple calender systema calender to track the passage of days
+optional_depends = default, dye