doc: prepare for asciidoc based specification
diff --git a/.gitignore b/.gitignore
index 45b52f4..41dd58e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,7 @@
 sim-applet/test
 .sim-keys*
 sim-keys*
+docs/*.pdf
+docs/build
+docs/common
+docs/*.png