Add option to add Google Site Verification meta tag

Gerben Geijteman

12.14.2020 b059770ac01dc106ad513e426d3ab2388183343d

 README.md

@@ -153,6 +153,13 @@
googleAnalytics = "UA-123-45"
```

### Google Site Verification
To use Google Site Verification, add the following line to the `[params]`:
```toml
googleSiteVerify = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
```
Replace the hash with the one Google provided you.

### Beautiful math functions
```toml
## Math settings