add libs

lib_gpio/.gitignore

@@ -0,0 +1,21 @@
+.*.swp
+**/.build*/*
+**/bin/*
+*.o
+*.xe
+*.vcd
+*.s
+*.xi
+*.i
+*.a
+**/_build/
+**/run_*.log
+**/pdf/*
+*.pyc
+test_results.csv
+**/.venv/**
+
+# waf build files
+.lock-waf_*
+.waf-*/
+build/