Add project creation instructions to quick-start guide

[ericstj]

Added instructions for creating a new project using PowerShell.

[learn-build-service-prod]

Learn Build status updates of commit 71b173f:

✅ Validation status: passed

File	Status	Preview URL	Details
agent-framework/tutorials/quick-start.md	✅Succeeded

For more details, please refer to the build report.

[learn-build-service-prod]

Learn Build status updates of commit 619168f:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• [Error: CannotMergeCommit] Cannot merge commit 619168fea8e1743df22c3d0bc9ecb20d243676d6 in branch patch-2 of repository https://github.com/ericstj/semantic-kernel-docs into branch main (commit cf43318c5d7616f2dd8a731b3355646d3968218a). Please follow this documentation: https://help.github.com/articles/resolving-a-merge-conflict-using-the-command-line/ to use git.exe to resolve you content conflicts locally and then push to remote.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

[learn-build-service-prod]

Learn Build status updates of commit 390f36a:

✅ Validation status: passed

File	Status	Preview URL	Details
agent-framework/tutorials/quick-start.md	✅Succeeded

For more details, please refer to the build report.