Updated Home (markdown)

Home.md

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-Some documentation
+Some documentation
+
+
+## System Requirements
+
+Most current web servers with PHP & MySQL installed will be capable of running PHPNuxBill
+
+Minimum Requirements
+
+- Linux or Windows OS
+- PHP Version 7.2+
+- Both PDO & MySQLi Support
+- GD2 Image Library
+- CURL support
+- MySQL Version 4.1.x and above
+
+can be Installed in Raspberry Pi Device.
+
+The problem with windows is hard to set cronjob, better Linux
+
+## Installation
+
+clone this repository or download zip or release
+ 
+1. Rename **pages_template** to **pages**
+2. Rename **config.sample.php** to **config.php** and make it writeable (chmod 777)
+3. make writeable folder **ui/cache/** and **ui/compiled**
+4. Open web and run installation
+5. set [cronjob](https://github.com/hotspotbilling/phpnuxbill/wiki/Cron-Jobs) or scheduller for **system/cron.php**
+6. make **config.php** unwriteable (chmod 644)
+
+
+## UPDGRADE
+
+for old version, below Version 6, backup **system/config.php**, delete all file except folder **pages**, upload all new files, put **config.php** in root folder (not in system folder), got to folder **/install** and run Update.
+
+for version 6 above, just replace all files, using filezilla can choose overwrite if different file size or time.
+
+or git pull if you use git clone