README: Add gif demo

[gaocegege]

Signed-off-by: Ce Gao gaoce@caicloud.io

What this PR does / why we need it:

Add demo in README

Special notes for your reviewer:

/cc @ddysher

Release note:

NONE

[caicloud-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[coveralls]

Pull Request Test Coverage Report for Build 35

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 14 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-42.7%) to 49.925%

---

Files with Coverage Reduction	New Missed Lines	%
pkg/s2i/configmap/configmap.go	14	63.64%
<!--	Total:	14		-->

Totals
Change from base Build 34:	-42.7%
Covered Lines:	331
Relevant Lines:	663

---

💛 - Coveralls

[ddysher]

hmm, same old problem with coverall?

[gaocegege]

Yeah...

[gaocegege]

/assign @ddysher

[ddysher]

manually merge