Update README.md

README.md

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 # nimredshift
-a minimalistic redshift GUI written in nim for Raspberry py OS
+A minimalist GUI for redshift on Raspberry py OS to change screen temperature, written in nim. It just a script written for my own usage, but someone might find it useful. It's much like [the one I wrote in python](https://github.com/aldoniel/pyredshift) except that the startup time is reduced because it's compiled, so you don't have to wait for the python interpreter to load. Also it's badly written because I just read the two first nim tuto, but it works.
+
+# Install
+  * you need the redshift package from the repository, if it's not already installed.
+  * download redshift-uing.nim
+  * install nim. Easiest way (but not up to date) is from the repository `sudo apt install nim`
+  * compile for example with `nim c -d:danger --opt:speed --app:gui`
+  * copy the artifact where you want, make executable, create a shortcut and run.
+  * if you trust me (but you shouldn't), you can also download a binary from github release on the right panel.