Mention release binaries

Signed-off-by: Sean Young <sean@mess.org>

docs/installing.rst

@@ -4,6 +4,17 @@ Installing Solang
 The Solang compiler is a single binary. It can be installed in many different
 ways, so the method that suits your needs.
 
+Download release binaries
+-------------------------
+
+For Ubuntu, there is a binary available in the github releases:
+
+`<https://github.com/hyperledger-labs/solang/releases/download/v0.1.2/solang_ubuntu>`_
+
+For Windows, there is a pre-built binary available here:
+
+`<https://github.com/hyperledger-labs/solang/releases/download/v0.1.2/solang.exe>`_
+
 Using hyperledgerlabs/solang docker hub images
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