add install instructions to docs

docs/source/install.rst

@@ -3,19 +3,60 @@ Installing
 
 Follow the instructions below to install EQY and its dependencies.
 
+CAD suite(s)
+************
+
+EQY is part of the `Tabby CAD Suite
+<https://www.yosyshq.com/tabby-cad-datasheet>`_ and the `OSS CAD Suite
+<https://github.com/YosysHQ/oss-cad-suite-build>`_! The easiest way to use sby
+is to install the binary software suite, which contains all required
+dependencies, including Yosys, SBY, and all its solvers.
+
+* `Contact YosysHQ <https://www.yosyshq.com/contact>`_ for a `Tabby CAD Suite
+  <https://www.yosyshq.com/tabby-cad-datasheet>`_ Evaluation License and
+  download link
+* OR go to https://github.com/YosysHQ/oss-cad-suite-build/releases to download
+  the free OSS CAD Suite
+* Follow the `Install Instructions on GitHub
+  <https://github.com/YosysHQ/oss-cad-suite-build#installation>`_
+
+Make sure to get a Tabby CAD Suite Evaluation License for industry-grade
+SystemVerilog and VHDL parsers!
+
+For more information about the difference between Tabby CAD Suite and the OSS
+CAD Suite, please visit https://www.yosyshq.com/tabby-cad-datasheet.
+
+Installing from source
+**********************
+
 Prerequisites
 -------------
 
-TBD
+EQY requires a matching version of `Yosys <https://github.com/YosysHQ/yosys>`_.
+We use `GitHub tags <https://github.com/YosysHQ/eqy/tags>`_ to indicate that a
+commit has been confirmed to work with that Yosys release version.
+
+Parts of EQY are Yosys plugins. To be able to load the plugins, they must be
+compiled in the same environment as the Yosys binary you are using. If you
+would like to build EQY from source but use a precompiled Yosys binary, you can
+use the `Tabby CAD Plugin Build docker environment 
+<https://github.com/YosysHQ-GmbH/tabby-cad-plugin-build>`_ to compile the EQY
+plugins (the environment works for both Tabby and OSS CAD Suite Yosys).
+
+To use ``[strategy sby]``, you also need to have a
+`matching version <https://github.com/YosysHQ/sby/tags>`_ of
+`SBY <https://github.com/YosysHQ/sby/>`_ installed, as well as the solvers you
+want to use.
 
 EQY
 ---
 
-https://github.com/YosysHQ/eqy
+Use these commands to build and install EQY:
 
 .. code-block:: text
 
    git clone https://github.com/YosysHQ/eqy.git eqy
    cd eqy
+   make
    sudo make install