Add PGP pubkey

Author: nurmukhametov

ISPC_GITHUB_ARTIFACTS.pem

@@ -0,0 +1,15 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=++it
+-----END PGP PUBLIC KEY BLOCK-----

downloads.html

@@ -78,6 +78,9 @@ <h1>Downloading The Intel® Implicit SPMD Program Compiler</h1>
             <li><a href="https://github.com/ispc/ispc/releases/download/v1.25.0/ispc-examples-v1.25.0.tar.gz">Examples packed in tar.gz archive (v1.25.0)</a></li>
             <li><a href="https://github.com/ispc/ispc/releases/download/v1.25.0/ispc-examples-v1.25.0.zip">Examples packed in zip archive (v1.25.0)</a></li>
           </ul>
+          <p>
+            All archives are signed with a following PGP <a href="ISPC_GITHUB_ARTIFACTS.pem">key</a>.
+          </p>
           <p>
             Here are alternative ways to download and install ISPC:
             <ul>