docs: fix subject-verb agreement in README

**Description**
I identified a minor grammatical error in the `README.md` file under the "Examples" section.

**Issue:**
The sentence "Additionally, our examples/ folder **contain** additional scripts" has a subject-verb agreement error. Since "folder" is singular, the verb should be "contains".

**Proposed Solution**
Update the verb to "contains" to fix the grammar. I will submit a PR for this specific fix.