Added README and install script

Run `./install.sh` to install cmakegen

diff --git a/README.md b/README.md
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+# CMakeGen
+### A CMakeLists.txt generator
+
+## Installation
+Run `sudo ./install.sh` to install. It installs to `/usr/local/bin`.
+
+## Usage
+Run `cmakegen` on its own (make sure `/usr/local/bin` is in path) to create a C++ project.
+
+Run `cmakegen -c` to create a C project.

diff --git a/install.sh b/install.sh
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+#!/bin/bash
+
+set -euxo pipefail
+
+if [ "$EUID" -ne 0 ]; then
+    echo "This script needs to run as root."
+fi
+
+cp CMakeLists.txt.* cmakegen /usr/local/bin
+
+echo "Installed cmakegen"