Add contributors from "easy issues" to README.md
Add contributors from "easy issues" to README.md

johan12345/opacclient,raphaelm/opacclient,geomcmaster/opacclient,ruediger-w/opacclient,opacapp/opacclient,opacapp/opacclient,johan12345/opacclient,geomcmaster/opacclient,opacapp/opacclient,opacapp/opacclient,thesebas/opacclient,johan12345/opacclient,johan12345/opacclient,ruediger-w/opacclient,ruediger-w/opacclient,ruediger-w/opacclient,thesebas/opacclient,johan12345/opacclient,raphaelm/opacclient,thesebas/opacclient,raphaelm/opacclient,ruediger-w/opacclient,opacapp/opacclient,geomcmaster/opacclient