getconf: add page (#9515)

* Create getconf.md

* Apply suggestions from code review as submitter failed to address them

* Fix syntax error

* Update getconf.md

* Update getconf.md

pages/linux/getconf.md

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+# getconf
+
+> Get configuration values from your Linux system.
+> More information: <https://manned.org/getconf.1>.
+
+- List [a]ll configuration values available:
+
+`getconf -a`
+
+- List the configuration values for a specific directory:
+
+`getconf -a {{path/to/directory}}`
+
+- Check if your linux system is a 32-bit or 64-bit:
+
+`getconf LONG_BIT`
+
+- Check how many processes the current user can run at once:
+
+`getconf CHILD_MAX`
+
+- List every configuration value and then find patterns with the grep command (i.e every value with MAX in it):
+
+`getconf -a | grep MAX`