Create README.md

Author: zeng-github01

README.md

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+# CDKey-CodeReward
+A Unturned Rocket Plugin about CDKey. Support MySQL
+
+# Permssion
+Command:CDK Permission CDK
+
+#Database editor
+Give Items<br>
+Items id,id,id ----one by one<br>
+Amount number,number,number ---one by one<br> 
+<br>
+Example: <br>
+method 1 Items:253,253,253 => item 253x3<br>
+
+method 2 Items:263. Amount:3 => item 253x3
+
+Give Permission<br>
+
+GrantPermissionGroup:vip<br> 
+ValidUntil:use Navicat to modify it.It determines the validity period of the permission group
+tip1: Permission Group ID,NOT DisplayName
+tip2:change "UsePermissionSync" to 1,
+it can let my another plugin "PermissionSync" to manager permission to give<br>
+
+change EnableRenew to 1.it can Enables CDK to be redeemed twice to extend the validity period of the permission group<br>
+ValidUntil needs to be modified synchronously to decide the extension time