Add CONTRIBUTING.md
Add CONTRIBUTING.md

kojilin/armeria,line/armeria,imasahiro/armeria,minwoox/armeria,jmostella/armeria,minwoox/armeria,line/armeria,dongjinleekr/armeria,jmostella/armeria,jonefeewang/armeria,line/armeria,jongyeol/armeria,synk/armeria,jonefeewang/armeria,anuraaga/armeria,minwoox/armeria,dongjinleekr/armeria,jongyeol/armeria,trustin/armeria,minwoox/armeria,kojilin/armeria,jmostella/armeria,kojilin/armeria,jmostella/armeria,synk/armeria,synk/armeria,minwoox/armeria,imasahiro/armeria,line/armeria,kojilin/armeria,kojilin/armeria,dongjinleekr/armeria,jongyeol/armeria,gotchazipc/armeria,gotchazipc/armeria,line/armeria,gotchazipc/armeria,jmostella/armeria,jonefeewang/armeria,synk/armeria,jongyeol/armeria,trustin/armeria,trustin/armeria,kojilin/armeria,jongyeol/armeria,jonefeewang/armeria,imasahiro/armeria,anuraaga/armeria,minwoox/armeria,trustin/armeria,anuraaga/armeria,anuraaga/armeria,line/armeria,imasahiro/armeria,dongjinleekr/armeria,dongjinleekr/armeria,gotchazipc/armeria,imasahiro/armeria,anuraaga/armeria,trustin/armeria,jonefeewang/armeria,trustin/armeria,anuraaga/armeria,gotchazipc/armeria