Added README

README.md

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+# Rendering the document
+
+## Install GIT
+
+Install git based on your OS https://git-scm.com/book/en/v2/Getting-Started-Installing-Git
+
+## Download Tectonic
+
+Tectonic is used to render the latex
+
+### Linux/MacOS
+
+The following shell command will download the latex tectonic binary.
+
+```
+curl --proto '=https' --tlsv1.2 -fsSL https://drop-sh.fullyjustified.net |sh
+```
+
+### NixOS
+
+Add the `tectonic` package.
+
+### Windows
+
+Download the prebuilt binary from https://github.com/tectonic-typesetting/tectonic/releases/download/tectonic%400.15.0/tectonic-0.15.0-x86_64-pc-windows-msvc.zip
+
+## Clone the repository and render the document
+
+```
+git clone https://git.5sigma.io/EdgeOfNight/core-book.git
+cd core-book
+/path/to/tectonic book.tex
+```