Add Oilpan documentation

Author: jacob-hughes

softdev.bib

@@ -3280,3 +3280,12 @@ @article{stichnoth99support
   pages={118--127},
   year={1999},
 }
+
+@misc{ager13oilpan,
+    author = {Ager, Mads and Corry, Erik and Egorov, Vyacheslav and Hara, Kentaro and Wibling, Gustav and Zerny, Ian},
+    year = {2013},
+    month = Dec,
+    title = {Oilpan: tracing garbage collection for {Blink}},
+    link = {https://docs.google.com/document/d/1y7_0ni0E_kxvrah-QtnreMlzCDKN3QP4BN1Aw7eSLfY},
+    note = {Accessed on 2023-10-12},
+}