added a simple class typing system

ruleset/characters/classes/types/types.md

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+Classes have one of three types which determine what [typefeats](typefeats.md) they can take on levelling up. You can determine which type a class is by looking at its [tags](../../../tags.md#class-types).
+
+# Spellcaster
+Spellcasters, or casters for short are classes like wizards, sorcerers, and bards. These classes are usually focused healing, support, or crowd control but have lmited health and single target damage.
+
+# Martial
+Martial classes focus on swords, bows, or other non-magical means of doing combat. They generally have more health, might be faster, or deal more single target damage but have limited crowd control or support options.
+
+# Mixed
+Mixed type classes are classes that use spells to suppliment their weapons, They generally have decent crowd control, support, single target damage, and health but are not as good at any of them as a spellcaster or martial.