Added README and other changes

README.md

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+# PSPNG
+
+Sample program to embed messages into PNG images
+
+## Install
+
+Requires zlib, pthread, and sodium header files to compile (These will be distro specific packages)
+
+Build:
+
+```bash
+make
+```
+
+System Wide:
+
+```bash
+make
+make install
+```
+
+## Usage
+
+Embed Message:
+
+pspng --compress -f {input file name} -o {output file name} -m "{input message}"
+
+Extract Message:
+
+pspng --uncompress -f {input file name}
+
+Help Message:
+
+pspng --help
+