Add a README.
Reviewed-by: Adam Langley <email@example.com>
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+BoringSSL is a fork of OpenSSL that is designed to meet Google's needs.
+Although BoringSSL is an open source project, it is not intended for general
+use, as OpenSSL is. We don't recommend that third parties depend upon it. Doing
+so is likely to be frustrating because there are no guarantees of API or ABI
+Programs ship their own copies of BoringSSL when they use it and we update
+everything as needed when deciding to make API changes. This allows us to
+mostly avoid compromises in the name of compatibility. It works for us, but it
+may not work for you.
+BoringSSL arose because Google used OpenSSL for many years in various ways and,
+over time, built up a large number of patches that were maintained while
+tracking upstream OpenSSL. As Google's product portfolio became more complex,
+more copies of OpenSSL sprung up and the effort involved in maintaining all
+these patches in multiple places was growing steadily.
+Currently BoringSSL is the SSL library in Chrome/Chromium, Android (but it's
+not part of the NDK) and a number of other apps/programs.
+There are other files in this directory which might be helpful:
+ * [PORTING.md](PORTING.md): how to port OpenSSL-using code to BoringSSL.
+ * [BUILDING.md](BUILDING.md): how to build BoringSSL
+ * [STYLE.md](STYLE.md): rules and guidelines for coding style.
+ * include/openssl: public headers with API documentation in comments. Also [available online](https://commondatastorage.googleapis.com/chromium-boringssl-docs/headers.html).