Add International Copper Association to extenders list.

[mxshea]

Impacted sections

List UNTP specification page(s) that are impacted by this issue.

• https://uncefact.github.io/spec-untp/docs/specification/DigitalProductPassport ](https://uncefact.github.io/spec-untp/docs/extensions/ExtensionsRegister)

Issue Description

Add Description and logo from International Copper Association to Extenders page.

Remember to add relevant labels.

[ashleythedeveloper]

Marking this pending close as PR #498 has been merged.