plugins/slurm: Add README.md for Slurm plugin

plugins/slurm/README.md

+# Slurm plugin
+
+This directory contains a Slurm plugin that enables the use of the
+Scord storage coordination service in Slurm jobs. The plugin consists
+of a shared object (`libslurmadmcli.so`) that is loaded by Slurm's plugin
+system and extends Slurm's functionalities.
+
+The `libslurmadmcli.so` shared library is a Slurm SPANK¹ plugin that extends
+Slurm's command line arguments to allow users to provide information for
+`scord`, serving as a simple interface between Slurm itself and the Scord
+storage coordination service².
+
+## Installation
+
+The plugin is written in C and requires the Slurm and the Scord C
+libraries to be compiled. It also requires access to the Slurm
+`spank.h` header. The plugin is compiled as a shared object that is
+loaded by Slurm's plugin system.
+
+Scord's build system can be used to compile the plugin. The following
+command will compile the plugin:
+
+```bash
+  $ make slurm-plugin
+```
+
+Once the shared object is compiled, it only needs to be copied
+somewhere the Slurm plugin system can pick it up. For example, if
+`libslurmadmcli.so` is installed in `/usr/local/lib/`, the following line
+should be added to the Slurm plugin configuration file (usually
+`/etc/slurm/plugstack.conf`)
+
+```conf
+  optional	/usr/local/lib/libslurmadmcli.so	scord_addr=ofi+tcp://127.0.0.1:52000 scord_proto=ofi+tcp://127.0.0.1 scordctl_bin=scord-ctl
+```
+
+The key-value pairs following the plugin are optional configuration
+variables.
+
+- `scord_addr`: The address to contact the Scord service in Mercury format
+  (default to ofi+tcp://127.0.0.1:52000)
+- `scord_proto`: The transport protocol to use in Mercury format (default
+  to ofi+tcp).
+- `scordctl_bin`: The scord-ctl binary to run on every node of an
+  allocation, can be the path to an executable (default to scord-ctl).
+
+## References
+
+1. See manual page spank(7) and <slurm/spank.h>
+2. See https://storage.bsc.es/gitlab/eu/admire/io-scheduler

plugins/slurm/slurmadmcli.txt

-# LIBSLURMADMCLI
-libslurmadmcli is a Slurm SPANK¹ plugin handling the ADMIRE adhoc
-storage CLI. It is a simple interface between Slurm and the Scord
-storage coordination service².
-
-# INSTALLATION
-See ../Makefile for details on how to compile libslurmadmcli.so. Note
-that it only depends on the Slurm and the Scord C libraries, and
-access to the slurm/spank.h header.
-
-Once the shared object is compiled, it only needs to be moved
-somewhere the Slurm plugin system can pick it up. For example, if
-libslurmadmcli.so is installed in /usr/local/lib/, the following line
-can be added to the Slurm plugin configuration file (usually
-/etc/slurm/plugstack.conf)
-
-	optional	/usr/local/lib/libslurmadmcli.so	scord_addr=ofi+tcp://127.0.0.1:52000 scord_proto=ofi+tcp://127.0.0.1 scordctl_bin=scord-ctl
-
-The key-value pairs following the plugin are optional configuration
-variables.
-- scord_addr: The address to contact the Scord service in Mercury format
-  (default to ofi+tcp://127.0.0.1:52000)
-- scord_proto: The transport protocol to use in Mercury format (default
-  to ofi+tcp).
-- scordctl_bin: The scord-ctl binary to run on every node of an
-  allocation, can be the path to an executable (default to scord-ctl).
-
-# REFERENCES
-1. See manual page spank(7) and <slurm/spank.h>
-2. See https://storage.bsc.es/gitlab/eu/admire/io-scheduler