Add the FixedGridLayout sample code.

This time with an Android.mk

P.S. Hi from Google I/O!

samples/FixedGridLayout/src/com/example/android/fixedgridlayout/FixedGridLayoutTest.java

@@ -0,0 +1,19 @@
+package com.example.android.fixedgridlayout;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+public class FixedGridLayoutTest extends Activity
+{
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.main);
+
+        FixedGridLayout grid = (FixedGridLayout)findViewById(R.id.grid);
+        grid.setCellWidth(80);
+        grid.setCellHeight(80);
+    }
+}