Add support for PEM certificates (#787)

* Support PEM

* net5

* 31

* txt

* FILE

* new

* Fixed

* .

* .

* RSA

examples/WireMock.Net.Console.NET6.WithCertificate/cert-rsa.pem

@@ -0,0 +1,28 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----