✨ feature: integrate a gitignore file (#75)

Right now the project has no gitignore file which causes files like
`.vscode` to show up as changed/ added files.

I've copied the gitignore from the main fiber repo

.gitignore

@@ -0,0 +1,30 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+*.tmp
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# IDE files
+.vscode
+.DS_Store
+.idea
+
+# Misc
+*.fiber.gz
+*.fasthttp.gz
+*.pprof
+*.workspace
+
+# Dependencies
+/vendor/
+vendor/
+vendor
+/Godeps/