Improve .gitignore and nimble of the package

.gitignore

@@ -7,3 +7,5 @@ build/
 *.dylib
 *.a
 *.la
+*.exe
+*.dll

nimbusLaunch.nimble

@@ -3,13 +3,16 @@ version       = "0.0.1"
 author        = "Status Research & Development GmbH"
 description   = "Create a Status Nim project skeleton"
 license       = "Apache License 2.0 or MIT"
-srcDir        = "src"
+
+# This is a pure binary package, only install the binary
+bin           = @["src/nimbusLaunch"]
+installDirs   = @[""]
 
 ### Dependencies
-
 requires "nim >= 0.18.0", "https://github.com/c-blake/cligen#head"
 
-proc test(name: string, lang: string = "cpp") =
+### Helper functions
+proc test(name: string, defaultLang = "c") =
   if not dirExists "build":
     mkDir "build"
   if not dirExists "nimcache":
@@ -19,5 +22,6 @@ proc test(name: string, lang: string = "cpp") =
   switch("out", ("./build/" & name))
   setCommand lang, "tests/" & name & ".nim"
 
+### tasks
 task test, "Run all tests":
   test "all_tests"