Add snapcraft.yaml and associated desktop support files

snap/gui/manuskript.desktop

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+[Desktop Entry]
+Name=Manuskript
+Comment=An open source tool for writers
+Keywords=manuskript;office;write;edit;novel;text;msk
+Exec=manuskript
+Terminal=false
+Type=Application
+Icon=/snap/manuskript/current/icons/Manuskript/manuskript.svg
+Categories=Office;WordProcessor;

snap/snapcraft.yaml

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+name: manuskript
+version: overwritten
+version-script: grep -E  "__version__.*\".*\"" "manuskript/version.py" | cut -d\" -f2
+summary: Manuskript is an open-source tool for writers.
+description: |
+  Manuskript provides a rich environment to help writers create their first draft and then further refine and edit their masterpiece.
+  With Manuskript you can:
+    Grow your premise from one sentence, to a paragraph, to a full summary
+    Create characters
+    Conceive plots
+    Construct outlines (Outline mode and/or Index cards)
+    Write with focus (Distraction free mode)
+    Build worlds
+    Track items
+    Edit and re-organize chapters and scenes
+    View Story line
+    Compose with fiction or non-fiction templates and writing modes
+    Export to HTML, ePub, OpenDocument, DocX, PDF, and more
+    Additionally Manuskript can help in many more ways with a spell checker, markdown highlighter, frequency analyzer, and automatic save in open and plain text file format.
+grade: stable
+confinement: strict
+base: core18
+icon: icons/Manuskript/manuskript.svg
+
+apps:
+  manuskript:
+    command: desktop-launch $SNAP/bin/manuskript
+    plugs:
+    - desktop
+    - desktop-legacy
+    - unity7
+    - wayland
+    - x11
+    - opengl
+    - home
+
+parts:
+  desktop-qt5:
+    build-packages:
+    - build-essential
+    - qtbase5-dev
+    - dpkg-dev
+    make-parameters:
+    - FLAVOR=qt5
+    plugin: make
+    source: https://github.com/ubuntu/snapcraft-desktop-helpers.git
+    source-subdir: qt
+    stage-packages:
+    - libxkbcommon0
+    - ttf-ubuntu-font-family
+    - dmz-cursor-theme
+    - light-themes
+    - adwaita-icon-theme
+    - gnome-themes-standard
+    - shared-mime-info
+    - libqt5gui5
+    - libgdk-pixbuf2.0-0
+    - libqt5svg5
+    - try:
+      - appmenu-qt5
+    - locales-all
+    - xdg-user-dirs
+    - fcitx-frontend-qt5
+
+  manuskript:
+    after: [desktop-qt5]
+    plugin: dump
+    source: https://github.com/olivierkes/manuskript.git
+    source-type: git
+    build-packages:
+      - python3
+      - python3-pyqt5
+      - python3-pyqt5.qtwebkit
+      - libqt5svg5
+      - python3-lxml
+      - zlib1g
+      - python3-enchant
+      - python3-markdown
+      - pandoc
+      - texlive-latex-recommended
+      - texlive-fonts-recommended
+      - texlive-luatex
+    stage-packages:
+      - python3
+      - python3-pyqt5
+      - python3-pyqt5.qtwebkit
+      - libqt5svg5
+      - python3-lxml
+      - zlib1g
+      - libc-bin
+      - locales
+      - python3-enchant
+      - python3-markdown
+      - pandoc
+      - texlive-latex-recommended
+      - texlive-fonts-recommended
+      - texlive-luatex