Add demo mTLS client certificates and key

Included at the repository owner's request for demonstration and
integration testing only. Revocable on the robot side; not for
production use.

certs/client_chain.crt

@@ -0,0 +1,95 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----