Add full README with install guide

README.md

@@ -2,30 +2,112 @@
 
 Lightweight SSH-based update manager for Linux systems.
 
+---
+
 ## Features
 
 - Check for updates across multiple hosts
-- Run upgrades remotely via SSH
-- Run autoremove
-- Simple inventory file
+- SSH-based (no agents)
+- Simple host inventory
 - No external dependencies
 
-## Usage
+---
 
-./update-manager.sh check
-./update-manager.sh update
-./update-manager.sh autoremove
-./update-manager.sh full
+## Installation
 
-## Hosts file format
+git clone <repo-url>
+cd update-manager
+chmod +x update-manager.sh
+./update-manager.sh install
 
-name|ip|ssh_user
+This will:
+
+- Install the tool in /opt/update-manager
+- Create global command: update-manager
+- Create config files if missing
+
+---
+
+## Configuration
+
+Edit hosts:
+
+nano /opt/update-manager/hosts.conf
+
+Format:
+
+name ip ssh_user
 
 Example:
 
-server1|192.168.1.10|user
+server1 192.168.1.10 user
+server2 192.168.1.20 user
+
+---
+
+## SSH (required)
+
+Passwordless SSH must be configured.
+
+ssh-keygen -t ed25519
+ssh-copy-id user@192.168.1.10
+
+Repeat for all hosts.
+
+Test:
+
+ssh user@192.168.1.10
+
+Should work without password.
+
+---
+
+## Usage
+
+update-manager check
+
+---
+
+## Output
+
+server1        🔴 2 updates
+server2        🟢 up-to-date
+server3        ❌ connection failed
+
+---
 
 ## Config
 
-HOSTS_FILE="${HOSTS_FILE:-/opt/update-manager/hosts.conf}"
-NTFY_URL=""
+/etc/update-manager.conf
+
+Default:
+
+HOSTS_FILE="/opt/update-manager/hosts.conf"
+SSH_OPTIONS="-o BatchMode=yes -o ConnectTimeout=5"
+
+---
+
+## Notes
+
+- hosts.conf and update-manager.conf are local files (not in Git)
+- .example files are templates
+- Existing config is not overwritten on reinstall
+
+---
+
+## Roadmap
+
+- update command
+- parallel execution
+- scheduled checks
+- logging integration
+
+---
+
+## Philosophy
+
+Keep it simple.
+
+- No agents
+- No dependencies
+- Just SSH