Add: README.md for latex compiling

arxiv-style/README.md

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+## Files layout
+- `arxiv.sty` and `template.tex`: The arxiv template we are using.
+
+- `equations.tex`: **Duplicated**, contains equations in methodology section
+
+- `main.tex` and `references.bib`:This prints out our paper, currently using arxiv template. Note that references are template independent.
+
+## How to compile
+It's recommanded to use `MiKTeX` as compiler on windows.
+
+To compile latex into pdf, follow these steps:
+
+```bash
+pdflatex ./main.tex
+
+# Build reference DB, run once unless references.bib updated
+bibtex main
+
+# Always running compiling command twice
+pdflatex ./main.tex
+pdflatex ./main.tex
+```
+
+## Troubleshooting
+If you encounter warnings during the compiling process, simply press `Enter`.
+
+If you find the reference in pdf is like `[??]`, compile twice.