feat: Add config manager

src/main/java/me/topchetoeu/smoothchunks/ConfigManager.java

@@ -0,0 +1,11 @@
+package me.topchetoeu.smoothchunks;
+
+import java.io.File;
+
+public class ConfigManager {
+    public final File configFile;
+
+    public ConfigManager(File configFile) {
+        this.configFile = configFile;
+    }
+}