ft readme add config

README.md

@@ -17,3 +17,25 @@ Require the [go programming language](https://golang.org/) (version >= 1.11)
 git clone git@github.com:edouardparis/lntop.git
 cd lntop && export GO111MODULE=on && go install ./...
 ```
+
+## Config
+
+First time `lntop` is used a config file `.lntop/config.toml` is created
+in the user home directory.
+```toml
+[logger]
+type = "production"
+dest = "/root/.lntop/lntop.log"
+
+[network]
+name = "lnd"
+type = "lnd"
+address = "//127.0.0.1:10009"
+cert = "/root/.lnd/tls.cert"
+macaroon = "/root/.lnd/data/chain/bitcoin/mainnet/admin.macaroon"
+macaroon_timeout = 60
+max_msg_recv_size = 52428800
+conn_timeout = 1000000
+pool_capacity = 3
+```
+Change macaroon path according to your network.