Added image for XSL plugin installation

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Moved project layout image to correct location

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Explained project creation with Eclipse

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Added images for XML processing and validation

Signed-off-by: Sebastian Hoß <mail@shoss.de>
Fixed typos

Signed-off-by: Sebastian Hoß <mail@shoss.de>