README : add build guide.

README.md

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+# Dmitry Voronin Resume.
+
+## How to build.
+```bash
+make $target
+```
+
+### Available targets.
+taget | description
+--- | ---
+all | Clean, build and view all languages.
+clean | Clean project from build files.
+en | Build English resume.
+ru | Build Russian resume.
+view | View built resumes in default PDF viewer.
+
+## Requirements.
+This project is built using TeX (LuaLaTeX) on GNU/Linux.
+
+### Texlive setup.
+```bash
+$ wget https://mirror.ctan.org/systems/texlive/tlnet/install-tl-unx.tar.gz
+$ tar -xf install-tl-unx.tar.gz
+$ rm install-tl-unx.tar.gz
+$ cd ./install-tl-*
+$ ./install-tl
+```