Create _SOURCE.md

wiki/_SOURCE.md

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+The [_SOURCE](_SOURCE) statement establishes the image SOURCE using a handle created by [_LOADIMAGE](_LOADIMAGE), [_NEWIMAGE](_NEWIMAGE) or [_COPYIMAGE](_COPYIMAGE).
+
+## Syntax
+
+> [_SOURCE](_SOURCE) handle&
+
+## Description
+
+* The handle is a [LONG](LONG) integer value from the [_SOURCE (function)](_SOURCE-(function)) function or a handle created by [_NEWIMAGE](_NEWIMAGE). 
+* If the handle is designated as 0, it refers to the current [SCREEN](SCREEN) image.
+* A source image can only supply information to a program. [POINT](POINT) and [GET (graphics statement)](GET-(graphics-statement)) might require a source other than the one currently active.
+
+## Example(s)
+
+```vb
+
+SCREEN 13
+a = _NEWIMAGE(320,200,13)
+_DEST a
+PSET (100, 100), 15
+_SOURCE a
+_DEST 0
+PRINT POINT(100, 100) 
+
+```
+
+```text
+
+ 15
+
+```
+
+> *Explanation:* Create a new image with handle 'a', then use [_DEST](_DEST) to define the image to draw on. Draw a pixel then set the source to 'a' and use [POINT](POINT) to show what color is in that position. White (15) and is the color set with [PSET](PSET). Use [_DEST](_DEST) 0 for the screen to display the results.
+
+### More examples
+
+See the examples in:
+
+* [Bitmaps](Bitmaps)
+* [SAVEIMAGE](SAVEIMAGE)
+* [SaveIcon32](SaveIcon32)
+
+## See Also
+
+* [_DEST](_DEST)
+* [_SOURCE (function)](_SOURCE-(function))
+* [POINT](POINT), [GET (graphics statement)](GET-(graphics-statement))