Update README.md

README.md

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 # ShareX-Custom-Upload
 A little PHP script created for uploading custom sharex files to your own webserver
+
+# Setup
+First start with the configuration file, found in /u/config.php here there are a few key settings
+```
+/* This is a secure key that only you should know, an added layer of security for the image upload */
+  'secure_key' => 'somerandomlongstringoftextforkey',
+
+/* This is the url your output will be, usually http://www.domain.com/u/, also going to this url will be the gallery page */
+  'output_url' => 'http://example.com/u/',
+
+/* This is a redirect url if the script is accessed directly */
+  'redirect_url' => 'http://example.com/',
+
+/* This is a list of IPs that can access the gallery page (Leave empty for universal access) */
+  'allowed_ips' => array('192.168.0.0', '0.0.0.0'),
+
+/* Page title of the gallery page */
+  'page_title' => 'My Upload Site',
+
+/* Heading text at the top of the gallery page */
+  'heading_text' => 'Uploading Site',
+```
+
+#ShareX Configuration
+Next we need to setup our ShareX to use the custom uploader
+```
+1. From the ShareX main application we go to Destinations > Destination Settings
+2. Scroll down to 'custom uploaders' add a new profile
+3. Request type POST, the url should be http://www.example.com/upload.php
+4. File from name `d'
+5. Arguments are:
+    - key, this should be set to the 'secure key' you set in your config.php
+    - name, this is how the files will be named, for mine, i use '%h.%mi.%s-%d.%mo.%yy'
+6. The setup is now complete, test your uploader and it 'should' work!
+```