docs: add more details around dev setup (#1489)
docs: add more details around dev setup (#1489)

Adds some detail around what environment variables to set for a local development environment

Signed-off-by: Snow Pettersen <18824beaba694b0802bee531b635db27ba08e6bb@lyft.com>
envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile,envoyproxy/envoy-mobile