docs: updated docs, added roadmap and more examples

Author: Arun Persaud

docs/source/images/Example-F1F8-tally.png

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+# Roadmap
+
+## 1.0 release
+
+- Parse most mcnp input and output files
+- Ability to change any aspect of an input file using python
+- Ability to run parameter scans automatically
+- Abiltiy to distribute, e.g. ptrac runs, across multiple cores/computersx