docs(intellij): add readme

Describe plugins and settings I cannot set automatically.

editor/intellij/README.md

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+# IntelliJ IDEA
+
+## PLUGINS
+Listing them here because I don't have anywhere better to put them
+- IdeaVim
+- Tab Shifter
+- IdeaVim-EasyMotion
+- AceJump
+- Material Theme UI
+- Lombok
+
+## SETTINGS
+
+### To enable Spring Auto Rebuild
+* Preferences -> Build, Execution, Deployment -> Compiler -> Build project
+automatically
+* Actions -> "Registry" -> Enable 'compiler.automake.allow.when.app.running'
+
+### To hide Tabs
+* Preferences -> Editor -> General -> Editor Tabs -> Tab placement = None
+* Also easily reachable via Actions
+
+### To hide tool window bars
+* Preferences -> Apperance & Behaviour -> Appearance -> Show tool window
+bars
+* Also easily reachable via Actions
+
+
+## KEYMAPS
+
+### Toggle VIM mode
+
+Set CMD + SHIFT + CTRL + V to toggle VIM plugin.