sketch a few more classpath classes

classpath/java/util/Map.java

@@ -0,0 +1,19 @@
+package java.util;
+
+public interface Map<K, V> {
+  public int size();
+
+  public V get(K key);
+
+  public V put(K key, V value);
+
+  public V remove(K key);
+
+  public interface Entry<K, V> {
+    public K getKey();
+
+    public V getValue();
+
+    public void setValue(V value);
+  }
+}