Update README.md

Author: GiggleLiu

README.md

@@ -4,14 +4,16 @@
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-## Installation
 <p>
 <code>UnitDiskMapping</code> is a &nbsp;
     <a href="https://julialang.org">
         <img src="https://raw.githubusercontent.com/JuliaLang/julia-logo-graphics/master/images/julia.ico" width="16em">
         Julia Language
     </a>
-    &nbsp; package for reducing a <a href="https://en.wikipedia.org/wiki/Independent_set_(graph_theory)">generic maximum (weighted) independent set problem</a>, <a href="https://en.wikipedia.org/wiki/Quadratic_unconstrained_binary_optimization"> quadratic unconstrained binary optimization (QUBO) problem</a> or <a href="https://en.wikipedia.org/wiki/Integer_factorization">integer factorization problem</a> to a maximum independent set problem on a unit disk grid graph (or hardcore lattice gas in physics), which can then be naturally encoded in neutral-atom quantum computers. To install <code>UnitDiskMapping</code>,
+    &nbsp; package for reducing a <a href="https://en.wikipedia.org/wiki/Independent_set_(graph_theory)">generic maximum (weighted) independent set problem</a>, <a href="https://en.wikipedia.org/wiki/Quadratic_unconstrained_binary_optimization"> quadratic unconstrained binary optimization (QUBO) problem</a> or <a href="https://en.wikipedia.org/wiki/Integer_factorization">integer factorization problem</a> to a maximum independent set problem on a unit disk grid graph (or hardcore lattice gas in physics), which can then be naturally encoded in neutral-atom quantum computers.
+
+## Installation
+To install <code>UnitDiskMapping</code>,
     please <a href="https://docs.julialang.org/en/v1/manual/getting-started/">open
     Julia's interactive session (known as REPL)</a> and press the <kbd>]</kbd> key in the REPL to use the package mode, and then type the command below:
 </p>