Added roadmap for the upcoming versions

Roadmap.md

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+## Overview
+
+**ONLYOFFICE Document Server** is an online office suite comprising viewers and editors for texts, spreadsheets and presentations, fully compatible with Office Open XML formats: .docx, .xlsx, .pptx and enabling collaborative editing in real time. This document provides the roadmap of the planned **ONLYOFFICE Document Server** changes.
+
+## Version 4.5
+
+### Server tasks
+
+* Scalability and Clustering
+* Security
+
+### Common tasks for all Editors
+
+* Charts Improvement (3D)
+* Paste Options (Keep Source Formatting, Merge Formatting, Keep Text Only etc.)
+* Document Templates
+* Development of editors add-ons for versioning (Chrome & Mozilla)
+* Undo/redo for fast collaborative editing
+* Opening password-protected documents
+
+### Document Editor improvement tasks
+
+* Versioning
+* Mail Merge
+* Footnotes, Endnotes 
+* Proportional table resize
+* AutoCorrect
+
+### Spreadsheet Editor improvement tasks
+
+* Formulas in AutoShapes
+* Adjustable cell format (number, currency, etc.)
+* Pivot tables
+* Multiselect
+* Conditional Formatting
+* Sparklines
+
+### Presentation Editor improvement tasks
+
+* Slide Notes
+* Columns (settings)
+* Improvement in opening PPT + ODP
+* Formulas in AutoShapes
+
+### Interface tasks
+
+* Customization
+* Renaming a file from the editor interface
+* Embedded viewers update
+* Web-based mobile version update
+
+### Desktop and mobile editors tasks
+
+* Development of co-editing for the Spreadsheet Editor for iPad
+
+## Version 5.0
+
+### Server tasks
+
+Security
+
+### Common tasks for all Editors
+
+* Korean, Chinese, Japanese and Arabic languages support improvement (vertical text + right-to-left) 
+* Korean, Chinese, Japanese and Arabic languages support improvement (canvas-based font rendering) 
+* Border styles (double)
+* Symbol Insertion (Character Map)
+* Development of editors add-ons for versioning (Chrome & Mozilla)
+* Undo/redo for fast collaborative editing
+* Commenting mode (restricted editing)
+* Protecting parts of a document from being edited
+* Protecting parts of a document from being copied
+* PDF Editor
+* Comparing two documents (+Merging into a single document)
+
+### Document Editor improvement tasks
+
+* Headings setup + table of contents + internal links
+* Footnotes, Endnotes
+* Setting custom column width (row height) in a table
+* Columns and rows distribution in a table
+* Combining and splitting of lists
+* Backgrounds
+* Different underlining (double line, wavy line, etc.)
+* Frames for pictures, templates
+* Non-breaking paragraph (wrapping)
+* Links between the titles
+* Hidden text
+* Watermarks (maybe as a plug-in)
+* Forms
+
+### Spreadsheet Editor improvement tasks
+
+* Effects (like in MS Office 2013)
+* Backgrounds
+* Print (Preview + header / footer + page breaks)
+* Formula bar (improvements)
+* Versioning
+* Data
+* Sheet and Data Protection
+* Splitting the window into several editor windows 
+* Modify the algorithm of auto-filling (make various options, for example, copy formatting only etc.)
+
+### Presentation Editor improvement tasks
+
+* Vertical text
+* Animation
+* Hide / restore slide
+* Header /footer + slide number + date and time
+* Video + audio
+* Themes
+* Theme Editor
+* Hyperlinks improvement (internal links - an analog of the ability to assign actions to inserted objects)
+
+### Interface tasks
+
+* Customization
+* Saving a copy of a document on the portal
+* Adding the information about updates in a new editor version
+* New interface
+
+### Desktop and mobile editors tasks
+
+* Development of an interface for the Document Editor for Android
+* Development of an interface for the Presentation Editor for iPad
+* Development of an interface for the Spreadsheet and Presentation Editors for Android
+* Development of co-editing for the Document Editor for iPad
+* Development of SDK and API of the common file manager for all editors on the base of WebDAV (for the integrators' usability)
+
+## Project Information
+
+Official website: [http:https://www.onlyoffice.org](http:https://onlyoffice.org "http:https://www.onlyoffice.org")
+
+Code repository: [https://github.com/ONLYOFFICE/DocumentServer](https://github.com/ONLYOFFICE/DocumentServer "https://github.com/ONLYOFFICE/DocumentServer")
+
+Docker Image: [https://github.com/ONLYOFFICE/Docker-DocumentServer](https://github.com/ONLYOFFICE/Docker-DocumentServer "https://github.com/ONLYOFFICE/Docker-DocumentServer")
+
+License: [GNU AGPL v3.0](https://help.onlyoffice.com/products/files/doceditor.aspx?fileid=4358397&doc=K0ZUdlVuQzQ0RFhhMzhZRVN4ZFIvaHlhUjN2eS9XMXpKR1M5WEppUk1Gcz0_IjQzNTgzOTci0 "GNU AGPL v3.0")
+
+SaaS version: [http:https://www.onlyoffice.com](http:https://www.onlyoffice.com "http:https://www.onlyoffice.com")
+
+## User Feedback and Support
+
+If you have any problems with or questions about [ONLYOFFICE Document Server][2], please visit our official forum to find answers to your questions: [dev.onlyoffice.org][1] or you can ask and answer ONLYOFFICE development questions on [Stack Overflow][3].
+
+ [1]: http:https://dev.onlyoffice.org
+ [2]: https://github.com/ONLYOFFICE/DocumentServer
+ [3]: http:https://stackoverflow.com/questions/tagged/onlyoffice