[doc] Add single-test procedure to README.md
[doc] Add single-test procedure to README.md
cozy-labs/cozy-desktop,nono/cozy-desktop,kosssi/cozy-desktop,cozy-labs/cozy-desktop,nono/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop,nono/cozy-desktop