Performs a lot of various changes

Adds some new command classes
Adds support for several languages
Adds README
Updates Java and Spigot versions
Adds command info and additional permission info to plugin.yml
Implements manual sign creation request cancelling

src/main/resources/plugin.yml

@@ -1,17 +1,35 @@
 name: PermissionSigns
 version: '${project.version}'
 main: net.knarcraft.permissionsigns.Permissionsigns
-api-version: 1.17
+api-version: 1.18
 prefix: PermissionSigns
 depend: [ Vault ]
 authors: [ EpicKnarvik97 ]
 description: A plugin for selling permissions using signs
 website: git.knarcraft.net
-
-permissions: 
+commands:
+  permissionsigns:
+    aliases:
+      - ps
+      - permsigns
+      - permsign
+      - signperm
+      - signperms
+    description: Used for all permission sign commands
+    usage: /<command> <about/create/cancel/reload> - Used for all permission sign commands
+permissions:
   permissionsigns.use:
     description: Allows players to use the permission signs
     default: true
   permissionsigns.admin:
+    description: Allows all administrative tasks such as creating permission signs and reloading
+    default: op
+    children:
+      permissionsigns.admin.reload: true
+      permissionsigns.admin.create: true
+  permissionsigns.admin.reload:
+    description: Allows the usage of the /reload command
+    default: op
+  permissionsigns.admin.create:
     description: Allows players to create/destroy permissionsigns
     default: op

src/main/resources/strings.yml

@@ -0,0 +1,11 @@
+en:
+  PREFIX: "[PermSign]"
+  MISSING_CREATION_INFO: "You must specify a sign name and a comma-separated list of permissions to create a permission sign"
+  TIME_UNIT: "seconds"
+  PERMANENT: "Permanent"
+  COST_FREE: "Free"
+  COST_INVALID_NUMBER: "The given cost is not a valid number"
+  DURATION_INVALID_NUMBER: "The given duration is not a valid number"
+  COMMAND_PLAYER_ONLY: "This command is only available to players"
+  PERMISSION_SIGN_DESTROY_DENY: "You do not have permissions to delete a permissions sign"
+  PERMISSION_SIGN_REMOVED: "Permissions sign removed"