I'm having problems configuring the plugin because when I put it in the plugins folder it does not create the configuration folder

What does your server log say?

**18:08:36 [WARNING] [ChangeSkin] Cannot check bungeecord support. You use a non-spigot build

18:08:36 [SEVERE] Error occurred while enabling ChangeSkin v2.3.2 (Is it up to date?)**
18:08:36 java.lang.NoClassDefFoundError: com/google/gson/JsonParseException
18:08:36 at com.github.games647.changeskin.core.ChangeSkinCore.(ChangeSkinCore.java:89) ~[?:?]
18:08:36 at com.github.games647.changeskin.bukkit.ChangeSkinBukkit.onEnable(ChangeSkinBukkit.java:73) ~[?:?]
18:08:36 at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:327) [craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at me.incomprehendable.dev.pwp.transparentlisteners.PerWorldPluginLoader.enablePlugin(PerWorldPluginLoader.java:141) [PerWorldPlugins.jar:?]
18:08:36 at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:404) [craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at org.bukkit.craftbukkit.v1_8_R1.CraftServer.loadPlugin(CraftServer.java:341) [craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at org.bukkit.craftbukkit.v1_8_R1.CraftServer.enablePlugins(CraftServer.java:313) [craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at net.minecraft.server.v1_8_R1.MinecraftServer.q(MinecraftServer.java:394) [craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at net.minecraft.server.v1_8_R1.MinecraftServer.k(MinecraftServer.java:362) [craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at net.minecraft.server.v1_8_R1.MinecraftServer.a(MinecraftServer.java:317) [craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at net.minecraft.server.v1_8_R1.DedicatedServer.init(DedicatedServer.java:190) [craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:484) [craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
18:08:36 Caused by: java.lang.ClassNotFoundException: com.google.gson.JsonParseException
18:08:36 at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_144]
18:08:36 at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit.jar:git-Bukkit-33d5de3]
18:08:36 at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_144]
18:08:36 at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_144]
18:08:36 ... 14 more
18:08:36 [INFO] [HolographicDisplays] Enabling HolographicDisplays v2.2.6

How about that: >Cannot check bungeecord support. You use a non-spigot build

Please use Spigot. It's from the same developers.