Update .gitignore file (#50)

... and commit the lockfile to always have a working development setup

Author: Turbo87

.gitignore

@@ -1,2 +1,12 @@
-target
-Cargo.lock
+# see https://github.com/github/gitignore/blob/master/Rust.gitignore
+
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb