Created Legacy support (markdown)

Legacy-support.md

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+If you use DungeonsXL with an older version than Minecraft 1.9, note that some features will not work.
+
+## Caliburn integration
+DungeonsXL uses the Caliburn API to fetch items from config. This does not work with 1.7.x and 1.8.x, though. These versions use a built-in, less powerful util with a slightly different syntax
+
+Example for a class script:
+```
+  #Name of the Classes
+Warrior:
+  #Items the Class has on the beginning
+  items:
+  #Item-Id/data, count, enchantment name/lvl
+  - 268,1,FIRE_ASPECT/1
+  - 276,1
+  - 302,1
+  - 303,1
+  - 304,1
+  - 305,1
+  - 364,1
+  - 373/16385,3
+```
+
+## Broken features
+* The /dxl deleteportal command does not work with 1.7.x.
+* Drop signs don't work with 1.7.x and 1.8.x.