Add qiskit-classroom to list. (#524)

Add qiskit-classroom to list.

---
Closes #523

Co-authored-by: mickahell <mickahell@users.noreply.github.com>

ecosystem/resources/members/qiskit-classroom.toml

@@ -0,0 +1,15 @@
+name = "qiskit-classroom"
+url = "https://github.com/KMU-quantum-classroom/qiskit-classroom"
+description = "Qiskit-classroom is a toolkit that helps implement quantum algorithms by converting and visualizing different expressions used in the Qiskit ecosystem using Qiskit-classroom-converter. The following three transformations are supported : Quantum Circuit to Dirac notation, Quantum Circuit to Matrix, Matrix to Quantum Circuit etc..."
+licence = "Apache License 2.0"
+contact_info = "_No response_"
+alternatives = "_No response_"
+affiliations = "_No response_"
+labels = [ "Visualization",]
+tier = "Community"
+website = "https://github.com/KMU-quantum-classroom"
+tests_results = []
+styles_results = []
+coverages_results = []
+skip_tests = false
+historical_test_results = []