Add INSTALL.rst instructions

INSTALL.rst

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+======================
+BUILD AND INSTALLATION
+======================
+
+This document describes how to build, install, and test the GHCiTUI program.
+
+-----------------
+Table of contents
+-----------------
+
+#. Working with the source
+
+   #. Getting the source
+   #. Building
+   #. Testing
+
+#. Installing from source
+
+======================
+Installing from source
+======================
+
+GHCiTUI is configured, built, and installed through ``cabal``:
+https://www.haskell.org/cabal/. Cabal can be installed through the ``ghcup``
+command line tool. Familiarity with Cabal is not necessary to build GHCiTUI.
+
+------------------
+Getting the source
+------------------
+
+Currently the source code is hosted on https://github.com. You can check out
+the source code using ``git`` with SSH:
+
+.. code:: shell
+
+  # SSH (for contributors, requires SSH set up)
+  git clone git@github.com:CrystalSplitter/ghcitui.git
+
+Or HTTPS:
+
+.. code:: shell
+
+  # HTTPS
+  git clone https://github.com/CrystalSplitter/ghcitui.git
+
+--------
+Building
+--------
+
+We should set up the Cabal project file with some configuration options before
+we build:
+
+.. code:: shell
+
+  cabal configure -O 
+
+For contributors, you'll want to enable testing:
+
+.. code:: shell
+
+  cabal configure -O \
+    --enable-tests \
+    --test-option='--color' \
+    --test-show-details=streaming