rrlp-ephemeris: Add .gitignore

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..88b45e4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+asn1_gen/*
+*.o
+*.a
+rrlp-test