Add info about Cardano connector to README.md

[alex-semenyuk]

Proposed changes

Add info about Cardano connector to README.md

---

Types of changes

• Bug fix
• New feature added
• Documentation Update

---

Please make sure to follow these points

• I have read the contributing guidelines.
• I have performed a self-review of my own code or work.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generates no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• My changes have sufficient code coverage (unit, integration, e2e tests).

---

Screenshots (If Applicable)

---

Other Information

[EnriqueL8]

Thanks @alex-semenyuk completely missed that