Create README.md

Creation of README.md with basic instructions on downloading and using the program.

README.md

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+# EDOPro HD Downloader
+
+Based on [AlexanderRST's Cards Downloader](https://github.com/AlexsanderRST/edopro-hd-cards-downloader)
+
+This programs downloads HD card images from [YGOPRODECK](ygoprodeck.com) database to replace the low resolution version which EDOPro downloads by default.
+
+# Installation
+
+## Windows
+
+Download the [latest Windows release](https://github.com/NiiMiyo/EDOPro-Hd-Downloader/releases/latest) and unzip it at your EDOPro folder (Default should be something like `C:/ProjectIgnis/`).
+
+## Non-Windows
+
+Since I can't test non-windows compilations you will need to download the source code and compile it yourself. Then put the compiled file at your EDOPro folder.
+
+
+# Usage
+
+If you run the program and read the instructions you should be fine.
+
+But for short:
+
+- Insert the name of your deck (without the `.ydk`) extension when asked to download all the images of the cards in it.
+
+- Insert `/allcards` to download images for all cards. Will probably take a while.
+
+- Insert `/allfields` to download artwork of all Field Spell Cards.
+
+- Insert `/help` if you want to know anything else.
+
+# License
+
+[MIT](https://douglas-sebastian.mit-license.org)