Add project files.

3rd-party/curl-7.52.1/docs/cmdline-opts/pinnedpubkey.d

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+Long: pinnedpubkey
+Arg: <hashes>
+Help: FILE/HASHES Public key to verify peer against
+Protocols: TLS
+---
+Tells curl to use the specified public key file (or hashes) to verify the
+peer. This can be a path to a file which contains a single public key in PEM
+or DER format, or any number of base64 encoded sha256 hashes preceded by
+\'sha256//\' and separated by \';\'
+
+When negotiating a TLS or SSL connection, the server sends a certificate
+indicating its identity. A public key is extracted from this certificate and
+if it does not exactly match the public key provided to this option, curl will
+abort the connection before sending or receiving any data.
+
+PEM/DER support:
+  7.39.0: OpenSSL, GnuTLS and GSKit
+  7.43.0: NSS and wolfSSL/CyaSSL
+  7.47.0: mbedtls
+  7.49.0: PolarSSL
+sha256 support:
+  7.44.0: OpenSSL, GnuTLS, NSS and wolfSSL/CyaSSL.
+  7.47.0: mbedtls
+  7.49.0: PolarSSL
+Other SSL backends not supported.
+
+If this option is used several times, the last one will be used.