Add screenshots

README.md

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 # Usage
 Run the program with Java 8 or newer, then select your input video and the output directory. It will automatically name the file to replace whatever VR video is in its place on the Labo. The program will hide itself until it is done, when you are able to load it into your fs-mitm on the console. You'll need FFMPEG for the conversion process.
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+# Screenshots
+![Main screen image](https://i.imgur.com/VkjiEQJ.png)
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+Main screen. Has various options for the conversion.
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+![Progress bar image](https://i.imgur.com/OuKvjbR.png)
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+A progress bar and an ETA is shown while converting.