Update dependency install instructions (#2)

Reviewed-on: #2

README.md

@@ -12,6 +12,17 @@ This project requires:
 - gtest (optional, for testing, will be installed by meson)
 - gcov (optional, for coverage reports)
 
+Install dependencies on Arch Linux
+``` bash
+pacman -S libusb spdlog pango cairo meson gcovr
+
+```
+
+Install dependencies on Debian/Ubuntu
+``` bash
+apt-get install libusb-1.0-0-dev libspdlog-dev libpango1.0-dev libcairo2-dev meson gcovr
+```
+
 ## Build
 
 Clone the repository and simply let meson do the heavy lifting.