Update readme to run server

.gitignore

@@ -1,2 +1,3 @@
 .idea/
 leveldb-ethdb-rpc
+environments/config.toml

Makefile

@@ -0,0 +1,4 @@
+# Build
+build:
+	go fmt ./...
+	go build

README.md

@@ -1,2 +1,26 @@
 # leveldb-ethdb-rpc
 Thin RPC wrapper around LevelDB to expose data remotely
+
+## Setup
+
+Run the following
+
+```bash
+make build
+```
+
+Create a `config.toml` file from [example.toml](./environments/example.toml) file.
+
+Update the config for path to geth leveldb and geth ancient database
+
+```toml
+[leveldb]
+    path = "/path/to/eth/data/geth/chaindata" # $LEVELDB_PATH
+    ancient = "/path/to/eth/data/geth/chaindata/ancient" # $LEVELDB_ANCIENT_PATH
+```
+
+## Usage
+
+After building the binary, run as
+
+`./leveldb-ethdb-rpc serve --config ./environments/config.toml`

cmd/root.go

@@ -79,6 +79,11 @@ func logLevel() error {
 	return nil
 }
 
+func init() {
+	cobra.OnInitialize(initConfig)
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file location")
+}
+
 // initConfig reads in config file and ENV variables if set.
 func initConfig() {
 	if cfgFile != "" {