Added missing readme file

Author: wmjordan

readme.md

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+# Sharp MuPDF
+
+Sharp MuPDF demonstats how to compile MuPDF source code into a dynamic link library and consume its functionality in .NET.
+
+## Compile
+
+To compile the source code.
+
+1. Install _Visual Studio 2019_ or newer versions.
+
+2. Install _python 3_ (`Python.exe` must be accessible via the PATH environment variable).
+
+3. Open the `MuPDF.sln` in the solution folder with Visual Studio.
+
+4. Compile the solution.
+
+5. During compilation, Python will be called to generate the definition file for the target dll file.
+
+6. Results:
+
+   `MuPDFLib` project will produce two DLL files for mupdf, one for x86 and the other for x64.
+
+   `Demo` project contains some code to demonstrate how to use functions in mupdflib.dll
+
+## Shrinking MuPDF.dll
+
+Open the property page for the `libmupdf` project.
+
+Add `;TOFU;TOFU_CJK_EXT` to _C/C++_/_Preprocessor_/_Preprocessor Definitions_ for _All Configurations_ and _All Platforms_ in configuration manager.
+
+So you can exclude several huge fonts from the DLL.
+
+## Update source code
+
+1. Use `git pull` command to update the repository.
+
+2. To update source code, tags and submodules, use
+
+   ``` bash
+   cd mupdf
+   git pull origin master --recurse-submodules
+   git checkout <TAG>
+   ```
+
+   To discard local modifications when updating submodules, use the following command before `pull`ing from master
+
+   ``` bash
+   git reset --hard --recurse-submodules origin/master
+   git reset --hard --recurse-submodules <TAG>
+   ```
+
+3. Check out whether the mupdf has upgraded to a new version. If so, change the FZ_VERSION before compiling the solution after update.
+
+## Git Proxy
+If accessing the Internet requires HTTPS proxy, use the following command:
+
+``` bash
+git config --global http.proxy <PROXY:PORT>
+git config --global https.proxy <PROXY:PORT>
+```
+
+When you are done, use the following command to reset the proxy to default:
+
+``` bash
+git config --global --unset http.proxy
+git config --global --unset https.proxy
+```
+
+## License
+
+This project follows the license terms of *MuPDF*.