Start of public OpenTitan development history

Code contributors:
Alex Bradbury <asb@lowrisc.org>
Cindy Chen <chencindy@google.com>
Eunchan Kim <eunchan@google.com>
Gaurang Chitroda <gaurangg@google.com>
Mark Hayter <mark.hayter@gmail.com>
Michael Schaffner <msf@google.com>
Miguel Osorio <miguelosorio@google.com>
Nils Graf <nilsg@google.com>
Philipp Wagner <phw@lowrisc.org>
Pirmin Vogel <vogelpi@lowrisc.org>
Ram Babu Penugonda <rampenugonda@google.com>
Scott Johnson <scottdj@google.com>
Shail Kushwah <kushwahs@google.com>
Srikrishna Iyer <sriyer@google.com>
Steve Nelson <Steve.Nelson@wdc.com>
Tao Liu <taliu@google.com>
Timothy Chen <timothytim@google.com>
Tobias Wölfel <tobias.woelfel@mailbox.org>
Weicai Yang <weicai@google.com>
diff --git a/doc/product.md b/doc/product.md
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+# The OpenTitan Product
+
+## Overview
+
+&lt;Paragraph about how OpenTitan will be used as a product, reference to Titan, brief purpose, etc&gt;
+
+## Features
+
+&lt;Paragraph about the features of the silicon and system around it, how it is used, pointer to top level silicon technical specification ../hw/doc/top_earlgrey.md&gt;
+
+## System Integration
+
+&lt;Paragraph about integration concepts at a high level, admissible architectures, eventual goal of integration schematics, OTPF&gt;
+
+## Open Source FPGA versus Final Silicon
+
+&lt;Brief dissertation into the distinction between OpenTitan the Open Source project (mention of FPGA as a target) and OpenTitan the silicon incarnation.
+Methods to ensure they are equivalent (early reference to compliance regime).
+Distinctions of silicon needs (foundry collateral, analog designs, security hardening, ASIC signoff flow).&gt;
+
+## Software and firmware
+
+&lt;mention of the importance of the software and firmware deliveries.
+List of expected software and firmware deliveries to come (Boot ROM, boot loaders, manufacturing code, operating system, final application, DIFs, etc).&gt;
+