[DirectShow/BaseClasses] add readme & LICENSE

src/BaseClasses/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) Microsoft Corporation
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ THE SOFTWARE.
+
+Portions of this repo are provided under the SIL Open Font License.
+See the LICENSE file in individual samples for additional details.

src/BaseClasses/Readme.md

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+DirectShow Base Classes
+=======================
+
+The DirectShow base classes are a set of C++ classes and utility functions designed for implementing DirectShow filters. 
+
+The base class library is provided as a SDK sample in the Microsoft Windows Software Development Kit (SDK).
+
++ Docs: [DirectShow Base Classes - Win32 apps | Microsoft Docs](https://docs.microsoft.com/en-us/windows/win32/directshow/directshow-base-classes)
++ Source code: [Windows-classic-samples/Samples/Win7Samples/multimedia/directshow/baseclasses](https://github.com/microsoft/Windows-classic-samples/tree/master/Samples/Win7Samples/multimedia/directshow/baseclasses)
++ [LICENSE](LICENSE) Copy from: [Windows-classic-samples/LICENSE](https://github.com/microsoft/Windows-classic-samples/blob/master/LICENSE)