Add README

README.md

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+# Geometry Dash Gamesave Cryptor
+## Download
+- The latest Windows binary (.exe) can be downloaded [here](https://github.com/xypwn/gd-gamesave-cryptor/releases)
+
+## Usage
+- `Shift`  + `Right Click` in the folder you dropped the .exe file into
+- Select `Open PowerShell window here`
+- In the PowerShell window, type one of the following:
+	- `.\gd_crypt -d` to decrypt and store the result in the current folder
+	- `.\gd_crypt -e` to encrypt and store the result in the current folder
+	- `.\gd_crypt -es` to encrypt and store the result in the Geometry Dash folder
+
+## Building from source on Linux
+#### Building for Linux
+- If you are using Proton to play GD, do not use Wine for the Windows version. Use this version instead as it automatically uses the correct path for Proton.
+- Clone the repository and cd into it
+
+`$ git clone https://github.com/xypwn/gd-gamesave-cryptor.git`
+
+`$ cd gd-gamesave-cryptor`
+- Build the binary:
+
+`$ make`
+- The executable is named `gd_crypt` and can be run with `./gd_crypt`
+#### Building for Windows
+- You will need to install your distro's version of `mingw-w64`
+	- `sudo apt install mingw-w64` on Ubuntu
+	- Install the AUR package `mingw-w64-gcc` on Arch Linux
+- Clone the repository and cd into it
+
+`$ git clone https://github.com/xypwn/gd-gamesave-cryptor.git`
+
+`$ cd gd-gamesave-cryptor`
+- Build the Windows binary:
+
+`$ make xcomp_linux_win`
+-  The executable is named `gd_crypt.exe`