[FAB-4313] Add vscode settings to gitignore
[FAB-4313] Add vscode settings to gitignore

Add vscode setting materials to gitignore, hence will not pollute the
source code with vscode ide.

Change-Id: I5263b8723d94cb56cc84785c4846b7838fc2cd7a
Signed-off-by: Baohua Yang <dee3cfe538de2f2fa60a015b83efd726c9fa0f84@cn.ibm.com>

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