PrmPkg/Application/PrmInfo: Add initial application

Adds a new UEFI application called "PrmInfo" that allows a user
to display and test Platform Runtime Mechanism (PRM) modules.

Execute the application help command for detailed usage
instructions and examples of how to use the application:
  "PrmInfo -?"

This application is intended to be helpful during PRM enabling
by allowing the user to:

1. Confirm that their firmware port of the PRM infrastructure
   implemented in this package is functioning correctly.

2. Quickly get information about what PRM modules and handlers
   are present on a given system.

3. Quickly test PRM handlers without booting to a fully featured
   operating system.

4. Develop and exercise PRM handlers prior to the availability of
   an operating system that is PRM aware.

Adds a brief section to Readme.md about the PrmInfo UEFI application
with a link to allow the reader to find more information about the
application if interested.

Cc: Andrew Fish <afish@apple.com>
Cc: Kang Gao <kang.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Benjamin You <benjamin.you@intel.com>
Cc: Liu Yun <yun.y.liu@intel.com>
Cc: Ankit Sinha <ankit.sinha@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Acked-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Liming Gao <gaoliming@byosoft.com.cn>
Acked-by: Leif Lindholm <quic_llindhol@quicinc.com>
Reviewed-by: Ankit Sinha <ankit.sinha@intel.com>

PrmPkg/Application/PrmInfo/PrmInfo.h

@@ -0,0 +1,49 @@
+/** @file
+  Prints information about the PRM configuration loaded by the system firmware.
+
+  Copyright (C) Microsoft Corporation. All rights reserved.
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef PRM_INFO_H_
+#define PRM_INFO_H_
+
+#include <Base.h>
+#include <Prm.h>
+#include <PrmDataBuffer.h>
+#include <Uefi.h>
+
+#define  APPLICATION_NAME   L"PrmInfo"
+
+#define PRM_HANDLER_CONTEXT_LIST_ENTRY_SIGNATURE SIGNATURE_32('P','R','H','E')
+
+#pragma pack(push, 1)
+
+typedef struct {
+  CHAR8                     *Name;
+  EFI_GUID                  *Guid;
+  PRM_DATA_BUFFER           *StaticDataBuffer;
+  CHAR8                     *ModuleName;
+  PRM_HANDLER               *Handler;
+} PRM_HANDLER_CONTEXT;
+
+typedef struct {
+  UINTN                     Signature;
+  LIST_ENTRY                Link;
+  PRM_HANDLER_CONTEXT       Context;
+} PRM_HANDLER_CONTEXT_LIST_ENTRY;
+
+#pragma pack(pop)
+
+//
+// Iterate through the double linked list. NOT delete safe.
+//
+#define EFI_LIST_FOR_EACH(Entry, ListHead)    \
+  for(Entry = (ListHead)->ForwardLink; Entry != (ListHead); Entry = Entry->ForwardLink)
+
+#define ONE_MICROSECOND (1000)
+#define ONE_MILLISECOND (1000 * ONE_MICROSECOND)
+#define ONE_SECOND      (1000 * ONE_MILLISECOND)
+
+#endif