Usage.md

+Custom achievements are created using simple `.yml` files, and anyone familiar with Mythic syntax should be able to pick up on how it works pretty quickly!
+
+## File Locations
+
+MythicAchievements will load achievements from 2 places:
+* The `Achievements` folder in the MythicAchievements plugin directory
+* Any `Achievements` folder in a Mythic pack (located in the MythicMobs plugin directory)
+
+Inside these folders you can have as many `.yml` files as you want, including inside other folders, allowing you to organize it however you want. The plugin will read all the files to load everything.
+
+## Syntax
+First, here's an overview of all the options:
+```
+KEY:
+  Display: 'the display name'
+  Description: 'the description'
+  Category: [CATEGORY_KEY]
+  Parent: [PARENT_ACHIEVEMENT_KEY]
+  Frame: [CHALLENGE/GOAL/TASK]
+  Icon:
+    Material: [MATERIAL]
+  Criteria:
+    SOME_KEY_NAME_YOU_CHOOSE:
+      Type: [CRITERIA_TYPE]
+      #
+      # other criteria-related options
+      #
+  Reward:
+    Message: 'A message displayed when they complete it!'
+    Drops:
+    - [ a Mythic drop table]
+    Skills:
+    - [ some skills ran when the achievement is completed ]1
+```
+
+## Examples
+
+In this example achievement, the player can earn it by killing 5 skeletons at night, but it's only available if they have completed the achievement `SOME_OTHER_ACHIEVEMENT`! 
+
+Upon completing, they will receive 50 cobblestone as a reward.
+```
+SKELETON_HUNTER:
+  Display: 'Skeleton Hunter'
+  Description: 'Kill 5 Skeletons at Night'
+  Category: SPECIAL
+  Parent: SOME_OTHER_ACHIEVEMENT
+  Frame: CHALLENGE
+  Icon:
+    Material: SKELETON_SKULL
+  Criteria:
+    KILL:
+      Type: KILL_MOB_TYPE
+      EntityType: SKELETON
+      Amount: 5
+      Conditions:
+      - night
+  Reward:
+    Message: 'You did it! You killed 5 skeletons at night!'
+    Drops:
+    - 50 cobblestone
+    Skills: []
+```
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