docs: added initial roadmap version (#641)

* docs: added initial roadmap version, added year symbol for features being developed

Author: antonkovalenko

README.md

@@ -2,7 +2,8 @@
 
 Local viewer for YDB clusters
 
-[Docs for users](https://ydb.tech/en/docs/maintenance/embedded_monitoring/ydb_monitoring)
+* [Docs for users](https://ydb.tech/en/docs/maintenance/embedded_monitoring/ydb_monitoring)
+* [Project Roadmap](ROADMAP.md)
 
 ## Preview
 

ROADMAP.md

@@ -0,0 +1,38 @@
+# YDB Embedded UI Roadmap
+
+## Legend
+We use the following symbols as abbreviations:
+
+1. ㉕ - feature appeared in the Roadmap for 2025;
+1. ㉔ - feature appeared in the Roadmap for 2024;
+1. ✅ - feature has been released;
+1. 🚧 - feature is partially available and is under development;
+1. ❌ - feature has been refused;
+1. 🔥 - not yet released, but we are in rush.
+
+## Diagnostics
+
+1. 🚧 ㉔ **Capacity diagnostics** – a set of signals on a database info tab to easily diagnose CPU or storage shortage
+1. 🔥 ㉔ **Basic built-in charts** – support for charts display for most popular signals: resource consumption, requests and latency
+1. 🔥 ㉔ **Display Table Hot Keys** – on a tab **Hot Keys** for a [column-oriented](https://ydb.tech/docs/en/concepts/datamodel/table#olap-data-types) and [row-oriented table](https://ydb.tech/docs/en/concepts/datamodel/table#row-orineted_table) display Hot Keys based on query statistics
+1. ㉔ **Network diagnostics** – display signals about cluster network performance and help to discover reasons for potential problems
+
+
+## Cluster Administration
+
+1. ㉔ **VDisk Eviction** – a special page for [VDisk](https://ydb.tech/docs/en/concepts/cluster/distributed_storage) with infos and support for [VDisk eviction](https://ydb.tech/docs/en/maintenance/manual/moving_vdisks) launch
+1. ㉔ **PDisk restart** – easy way to restart PDisk with one click from its page
+1. ㉔ **Display Configuration** – easy way to find out the value of any configuration paramater for a cluster or database
+1. ㉕ **Edit Configuration** – change the value of any configuration paramater for a cluster or database
+
+## Query and Schema Development
+
+1. 🔥 ㉔ **Autocompletion** – autosuggestions to complete sql keywords and schema elements' names
+1. ㉔ **Support VIEWS** – basic support for new schema object type – `VIEW`
+1. ㉔ **Support Asyncronous Replication** – basic support for new feature – cluster-to-cluster asyncrounous replication 
+1. ㉔ **Display Keys and Column Families** – add wider schema tab in Diagnostics mode with information about column families, primary and partitioning keys.
+1. ㉔ **Enhance Column Tables support** – display all parameters from `CREATE TABLE` statement on info Tab, add create/alter queries templates
+
+## Appearence 
+
+1. ㉕ **Change Table Column Width** – make it possible to alter a column (e.g. on a nodes page) width by dragging