exercism: add page (#7571)

Co-authored-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Co-authored-by: Axel Navarro <navarroaxel@gmail.com>
Co-authored-by: Starbeamrainbowlabs <sbrl@starbeamrainbowlabs.com>

pages/common/exercism.md

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+# exercism
+
+> Download and solve problems from the command-line.
+> More information: <https://exercism.org/docs/using/solving-exercises/working-locally>.
+
+- Configure the application token and the preferred workspace for Exercism:
+
+`exercism configure --token={{your-application-token}} --workspace={{/path/to/preferred/workspace}}`
+
+- Download a specific exercise:
+
+`exercism download --exercise={{exercise_slug}} --track={{track_slug}}`
+
+- Submit an exercise:
+
+`exercism submit {{path/to/file}}`
+
+- Print the path to the solution workspace:
+
+`exercism workspace`