add notes about aws ops manager in dedicated readme
add notes about aws ops manager in dedicated readme

[#141653361]

Signed-off-by: biju kunjummen <536798f244b376398572855223307ea15de1de8a@gmail.com>

rahulkj/pcf-pipelines,sandyg1/pcf-pipelines,rahulkj/pcf-pipelines,sandyg1/pcf-pipelines,cah-josephgeorge/pcf-pipelines,cah-josephgeorge/pcf-pipelines,pvsone/pcf-pipelines,pivotal-cf/pcf-pipelines,pivotal-cf/pcf-pipelines,cah-josephgeorge/pcf-pipelines,pvsone/pcf-pipelines,rahulkj/pcf-pipelines,sandyg1/pcf-pipelines,mcb/pcf-pipelines,BrianMMcClain/pcf-pipelines,pvsone/pcf-pipelines,beibeiyang/pcf-pipelines,mcb/pcf-pipelines,sandyg1/pcf-pipelines,rahulkj/pcf-pipelines,mcb/pcf-pipelines,beibeiyang/pcf-pipelines,pivotal-cf/pcf-pipelines,pivotal-cf/pcf-pipelines,BrianMMcClain/pcf-pipelines