Merge pull request #9 from siva-chegondi/doc-added

docs updated

README.md

@@ -1,9 +1,13 @@
-# Caddyvault
+# CaddyVault
 
 A TLS clustering plugin for caddyserver to use [Vault](https://vaultproject.io) as storage for storing TLS data like certificates, keys etc.,
 
 state: **ALPHA**
 
+## Prerequisite
+This plugin expects the following environment. 
+* You need a VAULT server running and accessible from the machine/s on which caddy is running.
+
 ## Extending caddy with CaddyVault plugin
 To extend caddy with CaddyVault plugin, we need to include following `import statement`
 in github.com/mholt/caddy/caddy/caddymain/run.go file.
@@ -17,5 +21,16 @@ import (
 ## Docker file
 
 Checkout following project for reference to build your own docker file.
-
 [CaddyVault Docker](https://github.com/siva-chegondi/caddyvault-docker)
+
+## Configuration
+
+### Vault configuration
+* We need to enable KV2 secrets engine on the path `certpaths`.
+
+### Caddy configuration
+* We can enable `CaddyVault` plugin by setting environment variable `CADDY_CLUSTERING` to `vault`.
+* Now set the following environment variables.
+
+ * CADDY_CLUSTERING_VAULT_ENDPOINT
+ * CADDY_CLUSTERING_VAULT_KEY