MdeModulePkg: Add sample help information for HelloWorld application.

Since Shell supports finding help information from resource section
of application image. We enhance the HelloWorld to add help information
string. After the HelloWorld are loaded in system the help string will
be stored in resource section of the application image.

Cc: Feng Tian <feng.tian@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

MdeModulePkg/Application/HelloWorld/HelloWorld.inf

@@ -6,7 +6,7 @@
 #
 #  It demos how to use EDKII PCD mechanism to make code more flexible.
 #
-#  Copyright (c) 2008 - 2014, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2008 - 2016, Intel Corporation. All rights reserved.<BR>
 #
 #  This program and the accompanying materials
 #  are licensed and made available under the terms and conditions of the BSD License
@@ -27,6 +27,11 @@
   VERSION_STRING                 = 1.0
   ENTRY_POINT                    = UefiMain
 
+#
+#  This flag specifies whether HII resource section is generated into PE image.
+#
+  UEFI_HII_RESOURCE_SECTION      = TRUE
+
 #
 # The following information is for reference only and not required by the build tools.
 #
@@ -35,6 +40,7 @@
 
 [Sources]
   HelloWorld.c
+  HelloWorldStr.uni
 
 [Packages]
   MdePkg/MdePkg.dec