Convert README to use markdown

Signed-off-by: nickthetait <nicholas.tait@ieee.org>

README.md

@@ -1,4 +1,6 @@
-This is "flawfinder" by David A. Wheeler, <dwheeler@dwheeler.com>.
+# About
+
+This is "flawfinder" by [David A. Wheeler](mailto:dwheeler@dwheeler.com).
 
 Flawfinder is a simple program that scans C/C++ source code and reports
 potential security flaws.  It can be a useful tool for examining software
@@ -7,20 +9,25 @@ static source code analysis tools more generally.  It is designed to
 be easy to install and use.  Flawfinder supports the Common Weakness
 Enumeration (CWE) and is officially CWE-Compatible.
 
-For more information, see:
- http://www.dwheeler.com/flawfinder
+For more information, see the [project website](http://www.dwheeler.com/flawfinder)
+
+# Platforms
 
 Flawfinder is designed for use on Unix/Linux/POSIX systems
 (including Cygwin, Linux-based systems, MacOS, and *BSDs) as a
 command line tool.  It requires Python 2.7 or Python 3.
 
+# Installation
+
 If you just want to *use* it, you can install flawfinder with
 Python's "pip" or with your system's package manager (flawfinder has
 packages for many systems).  It also supports easy installation
 following usual "make install" source installation conventions.
-The file INSTALL.txt has more detailed installation instructions.
+The file [INSTALL.txt](INSTALL.txt) has more detailed installation instructions.
 You don't HAVE to install it to run it, but it's easiest that way.
 
+# Usage
+
 To run flawfinder, just give it a list of source files or directories to
 example.  For example, to examine all files in "src/" and down recursively:
 
@@ -31,6 +38,8 @@ flawfinder (including its various options) and related information
 (such as how it supports CWE).  For example, the "--html" option generates
 output in HTML format. The "--help" option gives a brief list of options.
 
+# Under the hood
+
 More technically, flawfinder uses lexical scanning to find tokens
 (such as function names) that suggest likely vulnerabilities, estimates their
 level of risk (e.g., by the text of function calls), and reports the results.
@@ -42,8 +51,12 @@ vulnerabilities in programs that cannot be built or cannot be linked.
 Flawfinder also doesn't get as confused by macro definitions
 and other oddities that more sophisticated tools have trouble with.
 
+# Contributions
+
 We love contributions!  For more information on contributing, see
-the file CONTRIBUTING.md.
+the file [CONTRIBUTING.md](CONTRIBUTING.md).
+
+# License
 
 Flawfinder is released under the GNU GPL license version 2 or later (GPL-2.0+).
-See the COPYING file for license information.
+See the [COPYING](COPYING) file for license information.