add guild databasing and caching + guild creation and information cmds

src/main/java/dev/plex/guild/GuildHolder.java

@@ -0,0 +1,29 @@
+package dev.plex.guild;
+
+import com.google.common.collect.Lists;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+
+public class GuildHolder
+{
+    private static final List<Guild> GUILDS = Lists.newArrayList();
+
+    public void addGuild(Guild guild)
+    {
+        GUILDS.add(guild);
+    }
+
+    public void deleteGuild(UUID owner)
+    {
+        GUILDS.removeIf(guild -> guild.getOwner().equals(owner));
+    }
+
+    public Optional<Guild> getGuild(UUID uuid)
+    {
+        return GUILDS.stream().filter(guild -> guild.getOwner().equals(uuid) || guild.getMembers().contains(uuid)).findFirst();
+    }
+
+}