This patch add tutorial about using zephyr as guest.
Tracked-On: #2713
Signed-off-by: Kaige Fu <kaige.fu@intel.com>
---
v3 -> v4:
- Addressed two minor comments from David
v2 -> v3:
- Detail section `Build Zephyr`
- Add missing sudo
- Automatically boot zephyr
- Other grammar, phrasing fix
v1 -> v2:
- NUC7i5DNH -> NUC7i5DNHE.
- Add note about doc to build acrn supported zephyr image.
- Refine section `Boot Zephyr as User OS`.
- Some minor fix.
