new: create tables & add campaigns, runs, ps_boards, single run results

- currently, test automatically opens sqlitebrowser
- ext package is not well checked

ext/PSBoardDataBaseInteractiveUtilsExt.jl

@@ -0,0 +1,24 @@
+module PSBoardDataBaseInteractiveUtilsExt
+
+export import_dataframe
+
+using PSBoardDataBase
+using CSV
+using DataFrames
+using InteractiveUtils
+
+"""
+    import_dataframe() -> DataFrame
+
+Import dataframe from clipboard.
+"""
+function import_dataframe()
+    file = tempname()
+    finalizer(file) do x
+        @async rm(x)
+    end
+
+    CSV.read(file, DataFrame)
+end
+
+end # module