Add sonatype parent pom.
Add sonatype parent pom.

hejunbinlan/mortar,takn/mortar,venkatesh3007/mortar,vignesh-iopex/mortar,SpenceAcc/mortar,Anusha-M/mortar,brunobowden/mortar,georgelin422/mortar,square/mortar,xfumihiro/mortar,DmitriyZaitsev/mortar