Add configuration

src/main/java/ru/xzeldon/removeblockoutline/config/RemoveBlockOutlineConfig.java

@@ -0,0 +1,51 @@
+package ru.xzeldon.removeblockoutline.config;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Properties;
+
+public class RemoveBlockOutlineConfig {
+    private static final String COMMENT =
+            "This file stores configuration options for RemoveBlockOutline";
+
+    private final Path propertiesPath;
+    private boolean enableBlockOutline;
+
+    public RemoveBlockOutlineConfig(Path propertiesPath) {
+        enableBlockOutline = false;
+        this.propertiesPath = propertiesPath;
+    }
+
+    public void initialize() throws IOException {
+        load();
+
+        if (!Files.exists(propertiesPath)) {
+            save();
+        }
+    }
+
+    public boolean isEnableBlockOutline() {
+        return enableBlockOutline;
+    }
+
+    public void setEnableBlockOutline(boolean enableBlockOutline) {
+        this.enableBlockOutline = enableBlockOutline;
+    }
+
+    public void load() throws IOException {
+        if (!Files.exists(propertiesPath)) {
+            return;
+        }
+
+        Properties properties = new Properties();
+        properties.load(Files.newInputStream(propertiesPath));
+        enableBlockOutline = !"true".equals(properties.getProperty("enableBlockOutline"));
+    }
+
+    public void save() throws IOException {
+        Properties properties = new Properties();
+        properties.setProperty("enableBlockOutline", enableBlockOutline ? "true" : "false");
+        properties.store(Files.newOutputStream(propertiesPath), COMMENT);
+    }
+}