Add an info about new tool Writerside

_tools/writerside.md

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+---
+title: Writerside
+category: "websites"
+description: "Writerside is a new technical authoring and publishing environment from JetBrains."
+icon: writerside.png
+website: https://www.jetbrains.com/writerside/
+syntax:
+  - id: headings
+    available: y
+  - id: paragraphs
+    available: y
+  - id: line-breaks
+    available: n
+  - id: bold
+    available: y
+  - id: italic
+    available: y
+  - id: blockquotes
+    available: y
+    notes: "By default, the blockquotes markup will turn into an admonition block called a tip. One can change the block type to note or warning. Read more here: https://www.jetbrains.com/help/writerside/admonition-blocks.html"
+  - id: ordered-lists
+    available: y
+  - id: unordered-lists
+    available: y
+  - id: code
+    available: y
+  - id: horizontal-rules
+    available: n
+  - id: links
+    available: y
+  - id: images
+    available: y
+  - id: tables
+    available: y
+  - id: fenced-code-blocks
+    available: y
+  - id: syntax-highlighting
+    available: y
+  - id: footnotes
+    available: n
+  - id: heading-ids
+    available: y
+  - id: definition-lists
+    available: y
+  - id: strikethrough
+    available: y
+  - id: task-lists
+    available: n
+  - id: emoji-cp
+    available: y
+  - id: emoji-sc
+    available: n
+  - id: highlight
+    available: n
+  - id: subscript
+    available: y
+  - id: superscript
+    available: y
+  - id: auto-url-linking
+    available: y
+  - id: disabling-auto-url
+    available: y
+  - id: html
+    available: n
+---
+
+[Writerside](https://www.jetbrains.com/writerside/) is a new technical authoring and publishing environment from JetBrains. It consists of an editor, a static site builder, and a customizable frontend tailored specifically for technical documentation. 
+Created by JetBrains, Writerside is based on the IntelliJ platform.
+
+Writerside uses the [flexmark](https://github.com/vsch/flexmark-java) Markdown processor.
+
+{% include tool-syntax-table.html %}