docs: Add info about slurm to README

README.md

@@ -221,6 +221,11 @@ I very much encourage forking Pueue and I would love to see forks grow into othe
 
 ## Similar Projects
 
+#### slurm
+
+[Slurm](https://slurm.schedmd.com/overview.html) is a feature rich and widely used cluster management and scheduling system.
+If you find yourself in the need for complex setups such as multiple worker pools or distributed nodes, slurm will be much better suited than Pueue.
+
 #### GNU Parallel
 
 A robust and featureful parallel processor with text-based joblog and n-retries. [GNU Parallel](https://www.gnu.org/software/parallel/parallel_tutorial.html) is able to scale to multi-host parallelization and has complex code to have deep integration across different tools and shells, as well as other advanced features. `Pueue` differentiates itself from GNU Parallel by focusing more on visibility across many different long running commands, and creating a central location for commands to be stored, rather than GNU Parallel's focus on chunking a specific task.