Add example environment files

for letsencrypt and postgres

env.letsencrypt

@@ -0,0 +1,7 @@
+DOMAINS=example.org
+EMAIL=joe@example.org
+WEBROOT_PATH=/tmp/letsencrypt
+EXP_LIMIT=30
+CHECK_FREQ=15
+STAGING=0
+CHICKENEGG=

env.postgres

@@ -0,0 +1,3 @@
+POSTGRES_USER=fosspay
+POSTGRES_PASSWORD=superstrongpassword
+POSTGRES_DB=fosspay