Create Image type.

src/image.nim

@@ -0,0 +1,27 @@
+import base64, streams, os, strformat
+
+type Image* = ref object
+    filepath*: string
+    extension: string
+    base64Encoded: string
+
+proc newImage*(filepath: string): Image =
+    ## Reads from a file that exists at `filepath`. It reads the image data,
+    ## and image extension for later use.
+    var imageStream = newFileStream(filepath, fmRead)
+    if (not isNil(imageStream)):
+        let data = imageStream.readALL()
+
+        # Get the file's extension and remove the `.` from the start of it
+        result = Image(
+            extension: splitFile(filepath).ext.substr(1),
+            base64Encoded: encode(data),
+            filepath: filepath
+        )
+
+        imageStream.close()
+    else:
+        raise newException(IOError, "Failed to open file: " & filepath)
+
+proc imageToDataURI*(image: Image): string =
+    return fmt("data:image/{image.extension};base64,{image.base64Encoded}")