RAUC: add a demo cert for bundle signing

This was generated by running:

  openssl req -x509 -newkey rsa:4096 -keyout rauc-key.pem -out rauc-cert.pem \
   -days 3650 -nodes -subj "/O=CzechLight/CN=rauc-demo"

Storing it in Git is obviously terribly insecure, which means that this
certificate can only ever be used for throwaway examples and *not* for
anything real (ha ha).

Change-Id: Ib6ac081f665e837f94d41346778a12a9aac588fb
diff --git a/crypto/rauc-cert.pem b/crypto/rauc-cert.pem
new file mode 100644
index 0000000..cdce245
--- /dev/null
+++ b/crypto/rauc-cert.pem
@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
+MIIFJTCCAw2gAwIBAgIJAI1TVLrnVNVVMA0GCSqGSIb3DQEBCwUAMCkxEzARBgNV
+BAoMCkN6ZWNoTGlnaHQxEjAQBgNVBAMMCXJhdWMtZGVtbzAeFw0xNzEwMjAxMzE2
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+zVHWR8O7Li5pGglVDEjd+q4s3C2vVuMmWA==
+-----END CERTIFICATE-----
diff --git a/crypto/rauc-key.pem b/crypto/rauc-key.pem
new file mode 100644
index 0000000..8b30cba
--- /dev/null
+++ b/crypto/rauc-key.pem
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----