Amend README.md with configuration information

README.md

@@ -8,12 +8,14 @@
 [![Coverage Status](https://img.shields.io/coveralls/edno/codeception-secureshell.svg?style=flat-square)](https://coveralls.io/github/edno/codeception-secureshell?branch=master)
 [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg?style=flat-square)](https://raw.githubusercontent.com/edno/codeception-secureshell/master/LICENSE)
 
-The [Codeception](http://codeception.com/) module for **SSH commands** and **SSH tunnels**
+The [Codeception](http://codeception.com/) module for **SSH commands**, **SFTP access** and **SSH tunnels**
+
+If you just need a **SFTP** connection, please consider the in-built Codeception [FTP module](http://codeception.com/docs/modules/FTP).
 
 ## Roadmap
-- 0.1: Basic commands for testing remote file system and commands
-- 0.2: Tunnel commands
-- 0.3: Services and advanced commands
+- [x] **0.1**: Basic commands for testing remote file system and commands
+- [ ] 0.2: Tunnel commands
+- [ ] 0.3: Services and advanced commands
 
 ## Minimum Requirements
 - Codeception 2.2
@@ -38,3 +40,24 @@ module:
     enabled:
         - Codeception\Extension\SecureShell
 ```
+
+### Parameters
+By default the module always [accepts the host public key fingerprint](https://en.wikibooks.org/wiki/Guide_to_Unix/Explanations/Connecting_to_Remote_Unix#Accepting_the_Key_Fingerprint).  
+
+You can enable a strict mode where only known hosts will be accepted by setting the configuration parameter `StrictHostKeyChecking` to `true`.  
+Once enabled, the module will verify the host fingerprint against a `known_hosts` file located at the root directory of your Codeception project.
+```yaml
+modules:
+    config:
+        Codeception\Extension\SecureShell:
+            StrictHostKeyChecking: true
+```
+If you want to reuse an existing `known_hosts` file, you can use the parameter `KnownHostsFile` for specifying the location of the file.
+```yaml
+modules:
+    config:
+        Codeception\Extension\SecureShell:
+            StrictHostKeyChecking: true
+            KnownHostsFile: '/etc/ssh/known_hosts'
+```
+The file must respect the [OpenSSH **~/.ssh/known_hosts** format](https://en.wikibooks.org/wiki/OpenSSH/Client_Configuration_Files#.7E.2F.ssh.2Fknown_hosts).