ReadMe.rst: Add Apache License 2.0 and update submodule list

- Adds Apache License 2.0 as an acceptable source license per
  discussion in https://edk2.groups.io/g/devel/message/110226
- Updates the URL for existing licenses to match the current path
  used by opensource.org.
- The submodule list in this file is stale and is very prone to
  being forgotten. The list of submodules in the submodules setion
  is replaced with a link to .gitmodules which has an active list
  of submodules at any given time.

Cc: Andrew Fish <afish@apple.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Pedro Falcato <pedro.falcato@gmail.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Pedro Falcato <pedro.falcato@gmail.com>
diff --git a/ReadMe.rst b/ReadMe.rst
index ed1d482..06fb122 100644
--- a/ReadMe.rst
+++ b/ReadMe.rst
@@ -134,11 +134,12 @@
     copyright license as the base project. When that is not possible,

     then contributions using the following licenses can be accepted:

 

--  BSD (2-clause): http://opensource.org/licenses/BSD-2-Clause

--  BSD (3-clause): http://opensource.org/licenses/BSD-3-Clause

--  MIT: http://opensource.org/licenses/MIT

--  Python-2.0: http://opensource.org/licenses/Python-2.0

--  Zlib: http://opensource.org/licenses/Zlib

+-  Apache License, Version 2.0: https://opensource.org/license/apache-2-0/

+-  BSD (2-clause): https://opensource.org/license/BSD-2-Clause

+-  BSD (3-clause): https://opensource.org/license/BSD-3-Clause

+-  MIT: https://opensource.org/license/MIT

+-  Python-2.0: https://opensource.org/license/Python-2.0

+-  Zlib: https://opensource.org/license/Zlib

 

 For documentation:

 

@@ -243,19 +244,7 @@
 Submodules

 ----------

 

-Submodule in EDK II is allowed but submodule chain should be avoided

-as possible as we can. Currently EDK II contains the following submodules

-

--  CryptoPkg/Library/OpensslLib/openssl

--  ArmPkg/Library/ArmSoftFloatLib/berkeley-softfloat-3

--  MdeModulePkg/Universal/RegularExpressionDxe/oniguruma

--  MdeModulePkg/Library/BrotliCustomDecompressLib/brotli

--  BaseTools/Source/C/BrotliCompress/brotli

-

-ArmSoftFloatLib is actually required by OpensslLib. It's inevitable

-in openssl-1.1.1 (since stable201905) for floating point parameter

-conversion, but should be dropped once there's no such need in future

-release of openssl.

+The current submodules used in EDK II are in `.gitmodules <.gitmodules>`__.

 

 To get a full, buildable EDK II repository, use following steps of git

 command

@@ -283,6 +272,12 @@
 any code from, as well as needlessly downloading code we will not

 use.

 

+**Submodule Notes**

+

+ArmSoftFloatLib is required by OpensslLib. It's inevitable in openssl-1.1.1

+(since stable201905) for floating point parameter conversion, but should be

+dropped once there's no such need in future release of openssl.

+

 .. ===================================================================

 .. This is a bunch of directives to make the README file more readable

 .. ===================================================================