Added README and improved installation files

README.md

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+# Linux AMDGPU Control Application
+
+This application allows you to control your AMD GPU on a Linux system.
+
+![Screenshot]("https://i.imgur.com/c8jTTKy.png")
+
+Current features:
+
+- Viewing information about the GPU
+- Power/thermals monitoring
+- Fan curve control
+
+Currently missing:
+
+- Overclocking
+- Multi-GPU system support
+- The card model detection isn't very reliable
+
+# Installation
+
+- Arch Linux: Install the [AUR Package](https://aur.archlinux.org/packages/lact-git/)
+- Anything else:
+    - Install a rust toolchain and gtk3 development headers (libgtk-3-dev on ubuntu)
+    - Clone the repo
+    - sudo ./deploy.sh
+
+# Usage
+
+Enable and start the service (otherwise you won't be able to change any settings):
+```
+sudo systemctl enable --now lactd
+```
+You can now use the application.