doc(proposal): add pdf metatada and nasa citation

pub/proposal/references.bib

@@ -11,3 +11,14 @@
   day             = {3},
   url             = {https://www.ntsb.gov/investigations/Pages/DCA09MA026.aspx},
 }
+
+@article{nasa,
+  author = {Burian, Barbara},
+  year = {2006},
+  month = {10},
+  pages = {},
+  title = {Design Guidance for Emergency and Abnormal Checklists in Aviation},
+  volume = {50},
+  journal = {Proceedings of the Human Factors and Ergonomics Society Annual Meeting},
+  doi = {10.1177/154193120605000123}
+}