Update README.md

Author: grlicaa

README.md

@@ -1,2 +1,112 @@
 # GEN_PDF
-GEN_PDF is PL/SQL based generator for PDF
+
+## Demo
+A demo application is available on apex.oracle.com<br/>
+https://apex.oracle.com/pls/apex/f?p=89939
+
+
+## Changelog
+V 1.0.
+<ul>
+<li>Release date : 14/10/2015</li>
+</ul>
+
+
+## About
+
+GEN_PDF is PL/SQL based generator for PDF.
+
+GEN_PDF is mix of WPDF(1.4.8b) and AS_PDF3.
+
+Why ?
+- WPDF is great for setting position of custom tables, colors, borders ...
+- AS_PDF3 is great for importing fonts into PDF
+
+GEN_PDF is set to work on apex. Fonts and images are stored in WWV_FLOW_FILES or CUSTOM table, so there is no need to use UTL.FILE package (like in AS_PDF3)
+and there is also no need for "ordsys.ordImage" (like in PL_FPDF which don't work on XE db).
+
+You can find more info inside "GEN_PDF.pks"
+
+
+
+## How to use it
+
+Inside package are few samples which demonstrate almost all functionality of GEN_PDF tool.
+
+
+### List of samples inside package :
+<ul>
+<li>procedure emp_demo</li>
+<li>procedure fonts_demo</li>
+<li>procedure barcode_demo</li>
+<li>procedure rotate_demo</li>
+<li>procedure images_demo</li>
+<li>procedure testHeader</li>
+<li>procedure chart_demo</li>
+</ul>
+
+### Run sample:
+ 
+ Add apex Non-Modal dialog page and before header in process add PL/SQL code
+ ```sql
+BEGIN
+   gen_pdf.emp_demo();
+   apex_application.stop_apex_engine;
+END;
+```
+
+### Needed Rights
+For last sample "chart_demo" to work you need  :
+1. Grant on UTL_HTTP
+```sql
+  GRANT EXECUTE ON UTL_HTTP TO <USER>;
+```
+2. ACL permissions to get Google chart and QR code
+
+```sql
+     BEGIN
+        DBMS_NETWORK_ACL_ADMIN.CREATE_ACL (
+            acl          => 'chart.xml',
+            description  => 'Permissions to get chart image',
+            principal    => 'APEX_050000', -- APEX_SCHEMA depands on APEX version
+            is_grant     => TRUE,
+            privilege    => 'connect');
+        COMMIT;
+     END;
+     /
+     BEGIN
+        DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL (
+            acl          => 'chart.xml',
+            host         => 'chart.googleapis.com');
+        COMMIT;
+        END;
+     /
+     BEGIN
+        DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL (
+            acl          => 'chart.xml',
+            host         => 'zxing.org');
+        COMMIT;
+     END;
+     /
+```
+     
+In case you need to save file on server you can enable procedure "save_pdf".
+
+If you need reed file from server "font or pdf" than enable function "file2blob".
+
+For this to work you need grant on UTL_FILE.<br/>
+```sql
+  GRANT EXECUTE ON UTL_FILE TO <USER>;
+```
+   
+
+
+## About me
+Andrej Grlica<br/>
+I’m a oracle apex developer since 2008.<br/>
+Work email : [andrej.grlica@abakus.si](mailto:andrej.grlica@abakus.si)<br/>
+Private email : [andrej.grlica@gmail.com](mailto:andrej.grlica@gmail.com)<br/>
+Twitter : [@AndrejGrlica](https://twitter.com/AndrejGrlica)<br/>
+Linked-in : [Link](https://www.linkedin.com/in/andrej-grlica-303998a4/)<br/>
+Slack (#orclapex) PM:[@grlicaa](https://orclapex.slack.com/messages/@grlicaa/)
+