add compile instruction for linux to readme

[freddii]

in this issue: #7 (comment)
it is mentioned that it is possible to compile it for linux.
Sadly there is no exactly instruction how to compile it for linux.
Is it possible to get an instruction?

[TCB13]

Mostly the same as macOS:

1. Install Qt
2. Install https://github.com/therecipe/qt (follow the Linux instructions)
3. Download the code
4. cd LoFloccus
5. qtdeploy build desktop .

I'm currently considering rewriting this to drop therecipe/qt and make the UI fully C++ code and link it against a shared library containing the webdav server written in Go. This would reduce the size of the application and the complexity of the compiling / deploying...

[freddii]

As mentioned in:#4 (comment)

at the moment it is less hassle to simply run:
pip3 install WsgiDAV
pip3 install gevent
wsgidav -r /path/to/bookmarks/folder -p 8008 --auth anonymous --server gevent

flocus setup:
http://localhost:8008/
anonymous

[test-0-zero]

4. `cd LoFloccus`

5. `qtdeploy build desktop .`

when i compile i get this error message:

` /home/riccardo/go/bin/qtdeploy build desktop .
ERRO[0012] failed to run command _func=RunCmd cmd="go build -p 8 -v -ldflags=all="-s" "-w" -trimpath -o /home/riccardo/LoFloccus-master/deploy/linux/LoFloccus-master -tags=minimal" dir=/home/riccardo/LoFloccus-master env="XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session1 XDG_CURRENT_DESKTOP=MATE QT_AUTO_SCREEN_SCALE_FACTOR=0 PATH=/home/riccardo/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/local/go/bin XDG_CONFIG_DIRS=/etc/xdg/xdg-mate:/etc/xdg MATE_DESKTOP_SESSION_ID=this-is-deprecated TERM=xterm-256color COMPIZ_CONFIG_PROFILE=mate CGO_ENABLED=1 QT_ACCESSIBILITY=1 XDG_SESSION_CLASS=user GTK_OVERLAY_SCROLLING=0 GDMSESSION=mate SHELL=/bin/bash GTK_MODULES=appmenu-gtk-module:gail:atk-bridge:canberra-gtk-module HOME=/home/riccardo UBUNTU_MENUPROXY=1 OLDPWD=/home/riccardo GOROOT=/usr/local/go XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/riccardo XDG_SEAT=seat0 XDG_SESSION_TYPE=x11 GDM_LANG=it_IT VTE_VERSION=6003 QT_SCALE_FACTOR=1 CGO_LDFLAGS=-Wl,-rpath,$ORIGIN/lib -Wl,--disable-new-dtags SESSION_MANAGER=local/SSDUB18:@/tmp/.ICE-unix/197793,unix/SSDUB18:/tmp/.ICE-unix/197793 GOOS=linux _=/home/riccardo/go/bin/qtdeploy LANG=it_IT.UTF-8 XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0 LESSCLOSE=/usr/bin/lesspipe %s %s USER=riccardo LANGUAGE=it_IT DESKTOP_SESSION=mate SHLVL=1 PWD=/home/riccardo/LoFloccus-master XDG_SESSION_DESKTOP=mate DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus WINDOWID=56623110 XDG_DATA_DIRS=/usr/share/mate:/usr/local/share:/usr/share:/var/lib/snapd/desktop GOPATH=/home/riccardo/go XDG_VTNR=7 GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1 XDG_SESSION_ID=c10 GO111MODULE=off SSH_AUTH_SOCK=/run/user/1000/keyring/ssh LOGNAME=riccardo XAUTHORITY=/home/riccardo/.Xauthority QT_DIR=/home/riccardo/go/src/github.com/therecipe/env_linux_amd64_513 COLORTERM=truecolor QT_QPA_PLATFORMTHEME=gtk2 LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:.tar=01;31:.tgz=01;31:.arc=01;31:.arj=01;31:.taz=01;31:.lha=01;31:.lz4=01;31:.lzh=01;31:.lzma=01;31:.tlz=01;31:.txz=01;31:.tzo=01;31:.t7z=01;31:.zip=01;31:.z=01;31:.dz=01;31:.gz=01;31:.lrz=01;31:.lz=01;31:.lzo=01;31:.xz=01;31:.zst=01;31:.tzst=01;31:.bz2=01;31:.bz=01;31:.tbz=01;31:.tbz2=01;31:.tz=01;31:.deb=01;31:.rpm=01;31:.jar=01;31:.war=01;31:.ear=01;31:.sar=01;31:.rar=01;31:.alz=01;31:.ace=01;31:.zoo=01;31:.cpio=01;31:.7z=01;31:.rz=01;31:.cab=01;31:.wim=01;31:.swm=01;31:.dwm=01;31:.esd=01;31:.jpg=01;35:.jpeg=01;35:.mjpg=01;35:.mjpeg=01;35:.gif=01;35:.bmp=01;35:.pbm=01;35:.pgm=01;35:.ppm=01;35:.tga=01;35:.xbm=01;35:.xpm=01;35:.tif=01;35:.tiff=01;35:.png=01;35:.svg=01;35:.svgz=01;35:.mng=01;35:.pcx=01;35:.mov=01;35:.mpg=01;35:.mpeg=01;35:.m2v=01;35:.mkv=01;35:.webm=01;35:.ogm=01;35:.mp4=01;35:.m4v=01;35:.mp4v=01;35:.vob=01;35:.qt=01;35:.nuv=01;35:.wmv=01;35:.asf=01;35:.rm=01;35:.rmvb=01;35:.flc=01;35:.avi=01;35:.fli=01;35:.flv=01;35:.gl=01;35:.dl=01;35:.xcf=01;35:.xwd=01;35:.yuv=01;35:.cgm=01;35:.emf=01;35:.ogv=01;35:.ogx=01;35:.aac=00;36:.au=00;36:.flac=00;36:.m4a=00;36:.mid=00;36:.midi=00;36:.mka=00;36:.mp3=00;36:.mpc=00;36:.ogg=00;36:.ra=00;36:.wav=00;36:.oga=00;36:.opus=00;36:.spx=00;36:*.xspf=00;36: LESSOPEN=| /usr/bin/lesspipe %s DISPLAY=:0 XDG_RUNTIME_DIR=/run/user/1000 GOARCH=amd64 SSH_AGENT_PID=197878" error="exit status 2" name="build for linux on linux"
_/home/riccardo/LoFloccus-master
_/home/riccardo/LoFloccus-master
./LoFloccus.go:107:30: too many arguments in call to gui.NewQPixmap5
have (string, string, core.Qt__ImageConversionFlag)
want (gui.QPixmap_ITF)

`

[TCB13]

This issue is not invalid since the project was rewritten from the scratch.