Update readme

README.md

@@ -127,14 +127,35 @@ root_block_size = 120
 ## Defining Chains/Adding Chains
 
 The default of this repo is to build infra for the `sokol` chain, but you may not want that, or want a different set, so you need to
-create/edit `terraform.tfvars` or `user.auto.tfvars` and add the following configuration:
+`cp terraform.tfvars.example terraform.tfvars` and edit the following configuration:
 
 ```terraform
 chains = {
-    "mychain" = "url/to/endpoint"
+    "sokol" = "https://sokol.poa.network"
 }
 chain_trace_endpoints = {
-    "mychain" = "url/to/debug/endpoint/or/the/main/chain/endpoint"
+    "sokol" = "https://sokol-trace.poa.network"
+}
+chain_ws_endpoints = {
+    "sokol" = "wss://sokol-ws.poa.network/ws"
+}
+chain_logo = {
+    "sokol" = "/images/sokol_logo.svg"
+}
+chain_css_file = {
+    "sokol" = "sokol_variables"
+}
+chain_check_origin = {
+    "sokol" = "['//*.blockscout.com']"
+}
+chain_coin = {
+    "sokol" = "POA"
+}
+chain_network = {
+    "sokol" = "POA Network"
+}
+chain_subnetwork = {
+    "sokol" = "Sokol Testnet"
 }
 ```