Create placeholder django apps for credentials

ECOM-3057

openedx/core/djangoapps/credentials/__init__.py

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+"""
+edX Platform support for credentials.
+
+This package will be used as a wrapper for interacting with the credentials
+service to provide support for learners and authors to use features involved.
+"""

openedx/core/djangoapps/credentials/api/__init__.py

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+"""
+APIs for the credentials support.
+"""

openedx/core/djangoapps/credentials/api/urls.py

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+"""
+URLs for credential support views.
+"""

openedx/core/djangoapps/credentials/api/v1/views.py

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+"""
+Credentials API views (v1).
+"""

openedx/core/djangoapps/credentials/models.py

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+"""
+Models for credentials support for the LMS and Studio.
+"""

openedx/core/djangoapps/credentials/tasks.py

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+"""
+Celery tasks for credentials support views.
+"""

openedx/core/djangoapps/credentials/urls.py

@@ -0,0 +1,3 @@
+"""
+URLs for the credentials support in LMS and Studio.
+"""