Added merge method for serialziers

Author: Nan1t

build.gradle

@@ -5,7 +5,7 @@ plugins {
 }
 
 group 'ru.abstractmenus'
-version '1.0.1'
+version '1.0.2'
 
 repositories {
     mavenCentral()

src/main/java/ru/abstractmenus/hocon/api/serialize/NodeSerializers.java

@@ -18,6 +18,13 @@ public NodeSerializers(Map<Class<?>, NodeSerializer<?>> serializers) {
         this.serializers = serializers;
     }
 
+    /**
+     * Create new empty collection
+     */
+    public NodeSerializers() {
+        this(new HashMap<>());
+    }
+
     /**
      * Get serializer of specified type
      * @param type Value type
@@ -44,6 +51,18 @@ public <T> NodeSerializers register(Class<T> type, NodeSerializer<T> serializer)
         return this;
     }
 
+    /**
+     * Merge tho serializers collection to new collection
+     * @param serializers Another serializers collection
+     * @return New serializers collection with serializers both from current and another collection
+     */
+    public NodeSerializers merge(NodeSerializers serializers) {
+        NodeSerializers ser = new NodeSerializers();
+        ser.serializers.putAll(this.serializers);
+        ser.serializers.putAll(serializers.serializers);
+        return ser;
+    }
+
     /**
      * Create new default serializers list,
      * which contains serializers for all primitive types