Fix README.md

[Taku-Yamashita]

Fix: Update installation instructions in README.md

Changes:

• Updated the README.md file to clarify the correct way to define the image value in values.yaml.

Error:

$helm install local-ai go-skynet/local-ai -f values.yaml

coalesce.go:220: warning: cannot overwrite table with non table for local-ai.deployment.image (map[repository:quay.io/go-skynet/local-ai tag:latest])
Error: INSTALLATION FAILED: template: local-ai/templates/deployment.yaml:259:28: executing "local-ai/templates/deployment.yaml" at <.Values.deployment.image.repository>: can't evaluate field repository in type interface {}

Fixes:

• Fixes issue where Helm installation fails due to incorrect installation instructions in README.md.

Verification:

• Confirmed that the updated instructions in the README.md file allow for successful Helm installation.