add a new 'overview' MVC example

Former-commit-id: f73cbf6010595c639f6c5b5119e2ec41bc9802a5

_examples/mvc/repository/datasource/README.md

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+# Data Source / Data Store Layer

_examples/mvc/repository/datasource/movies.go

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+// file: datasource/movies.go
+
+package datasource
+
+import "github.com/kataras/iris/v12/_examples/mvc/repository/datamodels"
+
+// Movies is our imaginary data source.
+var Movies = map[int64]datamodels.Movie{
+	1: {
+		ID:     1,
+		Name:   "Casablanca",
+		Year:   1942,
+		Genre:  "Romance",
+		Poster: "https://iris-go.com/images/examples/mvc-movies/1.jpg",
+	},
+	2: {
+		ID:     2,
+		Name:   "Gone with the Wind",
+		Year:   1939,
+		Genre:  "Romance",
+		Poster: "https://iris-go.com/images/examples/mvc-movies/2.jpg",
+	},
+	3: {
+		ID:     3,
+		Name:   "Citizen Kane",
+		Year:   1941,
+		Genre:  "Mystery",
+		Poster: "https://iris-go.com/images/examples/mvc-movies/3.jpg",
+	},
+	4: {
+		ID:     4,
+		Name:   "The Wizard of Oz",
+		Year:   1939,
+		Genre:  "Fantasy",
+		Poster: "https://iris-go.com/images/examples/mvc-movies/4.jpg",
+	},
+	5: {
+		ID:     5,
+		Name:   "North by Northwest",
+		Year:   1959,
+		Genre:  "Thriller",
+		Poster: "https://iris-go.com/images/examples/mvc-movies/5.jpg",
+	},
+}