Create Build LogSeq Desktop for windows on Ubuntu.md

docs/Build LogSeq Desktop for windows on Ubuntu.md

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+# Building LogSeq Desktop app for Windows on Ubuntu
+## Intro
+My LogSeq dev machine is on Ubuntu 18.x and my production machine is running Windows 10, I needed a way to compile the LogSeq desktop APP for Windows.
+I tired & failed to make the "build" run on my windows machine but I did, however, succeed in letting my Ubuntu machine make Windows x64 files
+## Pre-requisites 
+These are the steps I took to make it work on my Ubuntu machine, sharing them hoping it helps someone else. I assume you have all the basic pre-requisites for LogSeq, if not you can find them at https://github.com/logseq/logseq#1-requirements
+1. clone LogSeq repo if you haven't already 
+`git clone https://github.com/logseq/logseq/`
+1. Install wine 
+```shell
+sudo dpkg --add-architecture i386
+sudo apt update
+sudo apt install wine64 wine32
+```
+1. Install winetricks & install dotnet using winetricks
+```shell
+sudo apt install winetricks
+
+winetricks dotnet46
+```
+1. Install nuget and mono (N.B. I had to install mono-complete for it to work)
+```shell
+sudo apt install nuget
+
+sudo apt-get install mono-complete
+```
+1. in `~/logseq/resources/package.json` line 10 `"electron:make": "electron-forge make --platform=win32 --arch=x64 --asar",`
+1. Compile using
+```shell
+cd logseq
+yarn
+yarn release
+yarn release-electron
+```
+the executable should be in the `static/out/make/squirrel.windows/x64/` folder