Create README.md

Author: usagirei

README.md

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+# PSO2 SymbolArt Thumbnail Handler
+
+Shell Extension for Windows Explorer to display Symbol Art file thumbnails and in the preview pane
+
+Makes it straightforward to browse your cache and pick which ones you want to import from windows explorer itself
+
+<details>
+  <summary>Sample Screenshot</summary>
+
+![image](https://user-images.githubusercontent.com/12700106/84848317-4d954f80-b029-11ea-8396-00715ba719b8.png)
+
+</details>
+
+# Requirements
+
+* Windows
+* Visual C++ 2019 Runtime (v142) <sup>[1](#msvcrt)</sup>
+* A OpenGL 3.3 capable card
+
+You can use the included SarConvert application to test if the thumbnail handler should work.
+
+# Installation/Removal
+
+* Grab the latest build from the releases page
+* Extract the zip file somewhere it won't be moved out of (like alongside your Tweaker/Game executable for instance)
+* Run the provided install/remove script as administrator
+
+or
+<details>
+<summary>Manual Installation</summary>
+
+* Open a Command Prompt as Administrator 
+* CD into the folder with the dll file
+* run `regsrv32 Pso2SarThumbnailHandler.x64.dll` or `regsrv32 Pso2SarThumbnailHandler.x86.dll` to install
+* run `regsrv32 /u Pso2SarThumbnailHandler.x64.dll` or `regsrv32 /u Pso2SarThumbnailHandler.x86.dll` to remove
+</details>
+
+
+</details>
+
+# SarConvert Utility
+
+Included in the release download, you can use it to test if the thumbnail handler should work, or simply to convert .sar files into .pngs
+
+### Usage:
+
+Droping one or more .sar files into the executable will create a 1:1 .png file of it, 
+For precise size control, run it from a command prompt or script file
+
+Passing a number as parameter will change the out size for the subsequent arguments
+
+Examples:
+
+`SarConvert.exe 512 input1.sar input2.sar ... inputN.sar` 
+will create 512px .pngs
+
+`SarConvert.exe 512 input1.sar 768 input2.sar 1024 input3.sar`
+will create 512, 768, and 1024px pngs respectively
+
+------
+
+<a name="msvcrt">1</a>: Visual C++ 2019 Runtime: [x86](https://aka.ms/vs/16/release/vc_redist.x86.exe) / [x64](https://aka.ms/vs/16/release/vc_redist.x64.exe)