implementations: add bwrap-oci

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

implementations.md

@@ -6,6 +6,7 @@ If you know of any associated projects that are not listed here, please file a p
 ## <a name="implementationsRuntimeContainer" />Runtime (Container)
 
 * [opencontainers/runc][runc] - Reference implementation of OCI runtime
+* [projectatomic/bwrap-oci][bwrap-oci] - Convert the OCI spec file to a command line for [bubblewrap][bubblewrap]
 
 ## <a name="implementationsRuntimeVirtualMachine" />Runtime (Virtual Machine)
 
@@ -26,3 +27,5 @@ If you know of any associated projects that are not listed here, please file a p
 [octool]: https://github.com/kunalkushwaha/octool
 [oct]: https://github.com/huawei-openlab/oct
 [runtime-tools]: https://github.com/opencontainers/runtime-tools
+[bwrap-oci]: https://github.com/projectatomic/bwrap-oci
+[bubblewrap]: https://github.com/projectatomic/bubblewrap