Add Cambodia holidays

README.rst

@@ -108,7 +108,7 @@ Available Countries
 .. _ISO 3166-2 code: https://en.wikipedia.org/wiki/ISO_3166-2
 .. _ISO 639-1 code: https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
 
-We currently support 129 country codes. The standard way to refer to a country
+We currently support 130 country codes. The standard way to refer to a country
 is by using its `ISO 3166-1 alpha-2 code`_, the same used for domain names, and
 for a subdivision its `ISO 3166-2 code`_. Some of the countries support more
 than one language for holiday names output.
@@ -227,6 +227,10 @@ The list of supported countries, their subdivisions and supported languages
      - BI
      -
      -
+   * - Cambodia
+     - KH
+     -
+     - en_US, **km**, th
    * - Cameroon
      - CM
      -

holidays/calendars/__init__.py

@@ -24,6 +24,8 @@
 
 GREGORIAN_CALENDAR = "GREGORIAN_CALENDAR"
 JULIAN_CALENDAR = "JULIAN_CALENDAR"
+KHMER_CALENDAR = "KHMER_CALENDAR"
+THAI_CALENDAR = "THAI_CALENDAR"
 
 
 def _get_nth_weekday_from(n: int, weekday: int, from_dt: date) -> date: