api: add a warning README
api: add a warning README

shobhit85/rkt,achanda/rkt,blixtra/rkt,ybubnov/rkt,yifan-gu/rocket,sinfomicien/rkt,kbrwn/rkt,alban/rkt,Wilybald/rkt,euank/rkt,euank/rkt,adfernandes/rkt,alban/rkt,blixtra/rkt,matthaias/rkt,ybubnov/rkt,shobhit85/rkt,Shashwatsh/rkt,dgonyeo/rkt,Wilybald/rkt,akshaykarle/rkt,endocode/rkt,mike1729/rkt,kinvolk/rkt,linki/rkt,akshaykarle/rkt,lucasallan/rkt,squeed/rkt,mike1729/rkt,iaguis/rkt,liugenping/rkt,Wilybald/rkt,rkt/rkt,sstabellini/rkt,rkt/rkt,joshix/rkt,matthaias/rkt,yifan-gu/rkt,liugenping/rkt,lucasallan/rkt,kbrwn/rkt,lucasallan/rkt,krnowak/rkt,ybubnov/rkt,intelsdi-x/rkt,linki/rkt,yifan-gu/rocket,nhlfr/rkt,sgotti/rkt,yifan-gu/rocket,jasonchaffee/rkt,rkt/rkt,iaguis/rkt,krnowak/rkt,cab105/rkt,achanda/rkt,markllama/rkt,monstermunchkin/rkt,markllama/rkt,joshix/rkt,il9ue/rkt,kinvolk/rkt,jasonchaffee/rkt,jjlakis/rkt,il9ue/rkt,kinvolk/rkt,sgotti/rkt,coreos/rkt,jjlakis/rkt,coreos/rkt,achanda/rkt,monstermunchkin/rkt,joshix/rkt,matthaias/rkt,tmrts/rkt,Wilybald/rkt,jakon89/rkt,jakon89/rkt,euank/rkt,kinvolk/rkt,jonboulle/rkt,yifan-gu/rkt,squeed/rkt,jjlakis/rkt,s-urbaniak/rkt,jonboulle/rkt,sgotti/rkt,il9ue/rkt,dgonyeo/rkt,endocode/rkt,blixtra/rkt,liugenping/rkt,nhlfr/rkt,krnowak/rkt,s-urbaniak/rkt,sinfomicien/rkt,dgonyeo/rkt,jzelinskie/rkt,lucasallan/rkt,Shashwatsh/rkt,jzelinskie/rkt,jakon89/rkt,intelsdi-x/rkt,cab105/rkt,akshaykarle/rkt,s-urbaniak/rkt,Shashwatsh/rkt,sstabellini/rkt,squeed/rkt,jasonchaffee/rkt,iaguis/rkt,markllama/rkt,tmrts/rkt,sstabellini/rkt,sinfomicien/rkt,rkt/rkt,joshix/rkt,nhlfr/rkt,jzelinskie/rkt,shobhit85/rkt,cab105/rkt,mike1729/rkt,coreos/rkt,intelsdi-x/rkt,endocode/rkt,kbrwn/rkt,yifan-gu/rkt,linki/rkt,jonboulle/rkt,tmrts/rkt,adfernandes/rkt,adfernandes/rkt,monstermunchkin/rkt,alban/rkt