You will need to create a xmind.desktop file. Look for a sample in /usr/share/applications and copy one to ~/.local/share/applications/xmind.desktop, and change the appropriate lines. The most important lines will be:
Name=
Exec=
GenericName=
Categories=
Icon=
Comment=
Terminal=false
The categories should be a semi-colon delimited list of the menu categories in which you want the program to appear. The exec should point the complete pathname of the executable. The genericname will be the name that actually appears in the menu. The comment is what appears when you hover the mouse over the menu entry. The icon can be an icon name if the icon is in a standard icon directory or a path.