Fix documentation for Sonny's source

[agrenott]

Link to google's documentation, which is properly describing how to setup a desktop application OAuth flow.

Closes #35

[codacy-production[bot]]

Coverage summary from Codacy

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Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (224884ed9deaf159bbf00f0eae10938bb743303a) | 2651 | 1971 | 74.35% | | | Head commit (662b59d2a8dc3764c693bb5ebc477a350b52aba5) | 2651 (+0) | 1971 (+0) | 74.35% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#38) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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