feat: add verispell submodule
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f19a5f6
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "verilog/rtl/verispell"]
+	path = verilog/rtl/verispell
+	url = https://github.com/wokwi/verispell
diff --git a/verilog/rtl/verispell b/verilog/rtl/verispell
new file mode 160000
index 0000000..321877c
--- /dev/null
+++ b/verilog/rtl/verispell
@@ -0,0 +1 @@
+Subproject commit 321877c8127d63b51137ba466594da137fc1dbcd