Feature/ add token examples #706

[j-chimienti]

Fixes #706

adds examples and tests for TokenTimelock and TokenVesting examples

🚀 Description

• 📘 I've reviewed the OpenZeppelin Contributor Guidelines
• ✅ I've added tests where applicable to test my new functionality.
• 📖 I've made sure that my contracts are well-documented.
• 🎨 I've run the JS/Solidity linters and fixed any issues (npm run lint:all:fix).

[pavsh]

it's an example so it should be more detailed and i would add how it works with the crowdsale contract. show a full example for an ICO

[nventuro]

Hi @j-chimienti, thanks for your contribution!

I may be missing something, but from what I can tell, these samples don't actually extend the base contracts in any way, they simply delegate construction to them. In that sense, they are not really examples, but rather extra tests to the original contracts. Was that your intent with this PR?

[nventuro]

Closing due to inactivity/intent not being clear (see above).