basic docs

docs/install.md

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+
+## Requirements
+- PHP 7.1.3+
+
+
+## Download precompiled build
+- Latest: [v7.0.0-RC2](https://github.com/filegator/static/raw/master/builds/filegator_v7.0.0-RC2.zip)
+- Unzip files and upload them to your PHP server
+- Make sure you webserver can read and write to ```/storage``` and ```/private``` folders
+- Set the website document root to ```/dist``` directory
+- Visit web page, if something goes wrong check ```/private/logs/app.log```
+- Login with default credentials ```admin/admin123```
+- Change default admin's password
+- Adjust ```configuration.php``` file