Created README

Author: michaelvlach

README.md

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+# cppcommandline
+
+Command line parser for C++11 and later using the fluid interface.
+
+# features
+
+- fluid interface
+- short and long names for options
+- positional arguments
+- value bindings
+- default values
+- required options
+- option descriptions
+- application name extraction
+- automatic help
+- error handling using standard exceptions
+
+# usage
+
+```
+#include <cppcommandline.h>
+
+int main(int argc, char **argv)
+{
+    cppcommandline::Parser commandLine;
+
+    std::string filename;
+    int someoption = 0;
+    bool flag = false;
+
+    commandLine.option().withDescription("A required filename").required().bindTo(filename); //positional
+    commandLine.option("someoption").asShortName("s").withDefaultValue(10).withDescription("My description of someoption").bindTo(someoption);
+    commandLine.option("flag").withDefaultValue(false).withDescription("My flag").bindTo(flag);
+    commandLine.parse(argc, argv);
+    
+    return 0;
+}
+```