add new release checklist [WIP]

docs/desktop-release.md

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+# New release checklist -
+
+## We need to cross check following things before pushing a new release + after updating electron version. This is just to make sure that nothing gets broken.
+## - Desktop notifications
+## - Spellchecker
+## - Auto updates
+  **Check for the logs in -**
+  - **on Linux:** `~/.config/Zulip/log.log`
+  - **on OS X:** `~/Library/Logs/Zulip/log.log`
+  - **on Windows:** `%USERPROFILE%\AppData\Roaming\Zulip\log.log`
+## - All the installer i.e.
+  - Linux (.deb, AppImage)
+  - Mac - (.dmg)
+  - Windows - (web installer for 32/64bit)
+## - Check for errors in console (if any)
+## - Code signing verification on Mac and Windows
+## - Tray and menu options
+# We need to cross check all these things on -
+- Windows 7
+- Windows 8
+- Windows 10
+- Ubuntu 14.04/16.04
+- macOSX
+
+
+