Start documenting the backend interfaces.

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diff --git a/docs/hazmat/bindings/interfaces.rst b/docs/hazmat/bindings/interfaces.rst
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+.. hazmat::
+
+Backend Interfaces
+==================
+
+.. currentmodule:: cryptography.hazmat.bindings.interfaces
+
+
+.. class:: CipherBackend
+
+    .. method:: cipher_supported(cipher, mode)
+
+        pass
+
+    .. method:: register_cipher_adapter(cipher_cls, mode_cls, adapter)
+
+        pass
+
+    .. method:: create_symmetric_encryption_ctx(cipher, mode)
+
+        pass
+
+    .. method:: create_symmetric_decryption_ctx(cipher, mode)
+
+        pass
+
+
+.. class:: HashBackend
+
+    .. method:: hash_supported(algorithm)
+
+        pass
+
+    .. method:: create_hash_ctx(algorithm)
+
+        pass
+
+
+.. class:: HMACBackend
+
+    .. method:: create_hmac_ctx(algorithm)
+
+        pass