`.polar` syntax highlighting in JetBrains-based IDEs

steps.md

1. create a new custom language type with the extension .polar
2. use the following list of reserved keywords (section 1)

and
cut
forall
if
in
matches
not
or
new

3. in section 2 the following list of operators

<
>
<=
>=
!=
*
+
-
/
:=
=
==
mod
rem

4. and the following list of functions (section 3)

print
debug