Add 'Economy Support'

Economy-Support.md

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+## Economy Support:
+
+The latest version of Stargate has support for Vault. Gate creation, destruction and use can all have different costs
+associated with them. You can also define per-gate layout costs. The default cost is assigned in the config.yml file,
+while the per-gate costs re defined in the .gate files. To define a certain cost to a gate just add these lines to your
+.gate file:
+
+```
+economy:
+  useEconomy: true
+  createCost: 5
+  destroyCost: 5
+  useCost: 5
+  toOwner: true
+```