Add PlatformType enum and add bStats platform chart

common/src/main/java/org/geysermc/common/PlatformType.java

@@ -0,0 +1,17 @@
+package org.geysermc.common;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public enum PlatformType {
+
+    BUKKIT("Bukkit"),
+    BUNGEECORD("BungeeCord"),
+    SPONGE("Sponge"),
+    STANDALONE("Standalone"),
+    VELOCITY("Velocity");
+
+    private String platformName;
+}