[version] add missing Gargantext/Version files

src/Gargantext/Version.js

+'use strict';
+
+const pkg = require('../../package.json');
+
+exports.version = pkg.version;

src/Gargantext/Version.purs

+module Gargantext.Version where
+
+
+import Data.Maybe (Maybe(..))
+import Effect.Aff (Aff)
+
+import Gargantext.Config.REST as REST
+import Gargantext.Ends (toUrl)
+import Gargantext.Sessions (Session(..))
+
+type Version = String
+
+
+foreign import version :: Version
+
+getBackendVersion :: Session -> Aff Version
+getBackendVersion (Session { backend }) = REST.get Nothing (toUrl backend "version")