update to master README with troubleshooting and links to specific products
update to master README with troubleshooting and links to specific products

update to master README with troubleshooting and links to specific
products

phpmaps/resource-proxy,phpmaps/resource-proxy,Esri/resource-proxy,Ricardh522/resource-proxy,Esri/resource-proxy,enjine/resource-proxy,bsvensson/resource-proxy,bsvensson/resource-proxy,Ricardh522/resource-proxy