Document our test keys

Add some basic documentation about each of the test keys that are in
the keys/ directory.

diff --git a/keys/README b/keys/README
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index 0000000..49991c6
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+These are various keys that have been used during testing.
+
+v4.key                 0x5DE480FC
+       A v4 RSA key, complete with RSA subkey.
+swhite.key
+       A v4 DSA/Elg key with 2 UIDs.
+mjr.new
+       A v4 DSA/Elg key with an updated binding signature on the subkey.
+manysubkeys.key
+       A v4 DSA key with 4 subkeys (DSA/Elg).
+iwj.key
+       A v2 RSA key.
+blackcat.key
+       A v3 RSA key.
+autodns.key
+       A v4 DSA/Elg key.
+noodles.key
+       My v4 DSA/Elg key.