Adding simple ConfigFilesProvider impl.

cfg4j-core/src/main/java/org/cfg4j/source/context/filesprovider/SimpleConfigFilesProvider.java

@@ -0,0 +1,34 @@
+package org.cfg4j.source.context.filesprovider;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A simple provider implementation that
+ */
+public class SimpleConfigFilesProvider implements ConfigFilesProvider {
+
+  private final List<Path> paths;
+
+  SimpleConfigFilesProvider(String... files) {
+    paths = new ArrayList<>(files.length);
+    for (String file : files) {
+      paths.add(Paths.get(file));
+    }
+  }
+
+  @Override
+  public Iterable<Path> getConfigFiles() {
+    return paths;
+  }
+
+  @Override
+  public String toString() {
+    return "SimpleConfigFilesProvider{" +
+      "paths=" + paths +
+      '}';
+  }
+
+}