Add openSUSE prerequisite instructions

These instructions were tested on openSUSE Tumbleweed and openSUSE Leap
15.1. There are some modules left that are not documented yet, but this
already improves the sitution for common openSUSE users.

modules/lang/nim/README.org

@@ -11,10 +11,10 @@ This module adds [[https://nim-lang.org][Nim]] support to Emacs.
 + Babel support (~ob-nim~)
 
 * Table of Contents :TOC:
-- [[Module Flags][Module Flags]]
-- [[Prerequisites][Prerequisites]]
-  - [[Nim][Nim]]
-- [[Configuration][Configuration]]
+- [[#module-flags][Module Flags]]
+- [[#prerequisites][Prerequisites]]
+  - [[#nim][Nim]]
+- [[#configuration][Configuration]]
 
 * Module Flags
 This module provides no flags.
@@ -44,4 +44,9 @@ brew install nim
 sudo pacman --needed --noconfirm -S nim nimble
 #+END_SRC
 
+*** openSUSE
+#+BEGIN_SRC sh :dir /sudo::
+sudo zypper install nim
+#+END_SRC
+
 * Configuration