add dev folder for calculating coverage in local environment

Author: jbytecode

dev/Project.toml

@@ -0,0 +1,2 @@
+[deps]
+Coverage = "a2441757-f6aa-5fb2-8edb-039e3f45d037"

dev/coverage.jl

@@ -0,0 +1,18 @@
+import Pkg
+
+Pkg.activate("../")
+Pkg.resolve()
+
+import Coverage
+
+Pkg.test(coverage = true)
+
+tested, total = Coverage.process_folder("../") |> Coverage.get_summary
+
+ratio = tested / total
+
+Coverage.clean_folder("../")
+
+
+@info "Coverage: $ratio"
+