Refresh assistant.xml and icon files

.gitignore

@@ -1,3 +1,10 @@
 *.user
 *-build-*
 *.qm
+build
+*.o
+*.cpp
+*.h
+.qmake.stash
+plantumlqeditor
+Makefile

README.md

@@ -23,3 +23,13 @@ If you want to save a specific image, export it via the File menu or using the C
 The editor also supports an assistant that allows easy insertion of code snippets into the editor. The assistant is defined by a simple XML and a bunch of icons, one for each snippet.
 
 ![main window](docs/mainwindow.png?raw=true "Main Window")
+
+
+Ubuntu installation
+
+
+```
+sudo apt install cmake libqt5svg5-dev
+./generate_icons.py
+cmake --build .
+```