misc: add FEATURE.yaml files

For src/vnet/classify, src/vnet/cop, src/vnet/pg, and src/vlib/unix

Type: docs

Signed-off-by: Dave Barach <dave@barachs.net>
Change-Id: Ib6ab734608693a1e9562a44808246950616e8d36
diff --git a/src/vnet/pg/FEATURE.yaml b/src/vnet/pg/FEATURE.yaml
new file mode 100644
index 0000000..5dfdbf6
--- /dev/null
+++ b/src/vnet/pg/FEATURE.yaml
@@ -0,0 +1,13 @@
+---
+name: PG
+maintainer: Dave Barach <dbarach@cisco.com>
+features:
+  - High-speed packet generation
+  - Packet definition CLI
+  - Support for pcap capture replay
+  - Multi-thread packet generation
+  - Packet injection into arbitrary graph nodes
+  - Heavily used by "make test"
+description: "High-speed packet generator"
+state: production
+properties: [CLI, MULTITHREAD]