CMS: add publication links in CMS reseach guide

[katilp]

Add under the "Performing an analysis" section of the CMS Guide for Research two additional recent papers (https://arxiv.org/abs/1902.04222, https://arxiv.org/abs/1908.08542)

[jmduarte]

Also:

• https://arxiv.org/abs/1909.12285 (not yet published)
• https://arxiv.org/abs/1902.08276 (not yet published)
• https://arxiv.org/abs/1906.06242 (not yet published)
• https://arxiv.org/abs/1907.08197 (published in JINST 15 (2020) 01, P01009, https://doi.org/10.1088/1748-0221/15/01/P01009)
• https://arxiv.org/abs/1807.11916 (published in Comput Softw Big Sci 4, 6 (2020). https://doi.org/10.1007/s41781-020-00038-8)
• https://arxiv.org/abs/1704.05842 (published in Phys. Rev. D 96, 074003 (2017). https://doi.org/10.1103/PhysRevD.96.074003)

More can be found here: http://old.inspirehep.net/search?ln=en&p=reference%3A10.7483%2FOPENDATA.CMS&of=hb&action_search=Search&sf=earliestdate&so=d

@vlimant

[jmhogan]

Version in PR #3585 will provide a general link to the InspireHEP page linked to the DOI -- an easy way to capture the recent papers without the page getting stale.