Adding footer/logo to the image - Action Script needed

/* ==========================================================
// 2017  John J. McAssey (JJMack) 
// ======================================================= */
// This script is supplied as is. It is provided as freeware. 
// The author accepts no liability for any problems arising from its use.
/*
<javascriptresource>
<about>$$$/JavaScripts/PlaceWatermark/About=JJMack's PlaceWatermark ^r^rCopyright 2017 Mouseprints.net^r^rPhotoshop Script^rCustomize using first four var</about>
<category>JJMack's Script</category>
<enableinfo>true</enableinfo>
</javascriptresource>
*/
#target photoshop;  
app.bringToFront();  
var logoFile = "~/Desktop/JJMack.png";						// Watermark file should be large for resize down works better than up
var LogoSize = 10;											// percent of document height to resize Watermark to
var LogoMargin = 1;                                         // percent of Document height the Watermark should have as a margin
var BottomLetf = false;										// false = Bottom Right true Bottom Left 
//placeWatermark(logoFile, LogoSize, LogoMargin);           // Place Watermark into the bottom of the document
if (documents.length) app.activeDocument.suspendHistory('placeWatermark','placeWatermark(logoFile,LogoSize,LogoMargin)' );
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
function placeWatermark(Image,Size,Margin){  
	if(!documents.length) return;  							// if no document return
		var fileObj = new File(Image);	                	// the passed file
	if(!fileObj.exists){  									// If file does not exits tell user 
		alert(fileObj.name  + " does not exist!"); 			// Alert User 
		return;  											// return
		}  
	try{  
		var doc = app.activeDocument;						// set Doc object to active document
		app.displayDialogs = DialogModes.NO;				// Dialog off 
		var strtRulerUnits = app.preferences.rulerUnits;	// Save Users ruler units 
		var strtTypeUnits = app.preferences.typeUnits;		// Save Users Type units 
		app.preferences.rulerUnits = Units.PIXELS;			// work with pixels 
		app.preferences.typeUnits = TypeUnits.PIXELS;		// work with pixels 
		var layers = app.activeDocument.layers;				// get layers
		app.activeDocument.activeLayer = layers[0];			// Target Top Layer
		placeFile(fileObj); 								// Place in file the Watermark png file
		activeDocument.activeLayer.resize(100 ,100,AnchorPosition.MIDDLECENTER); // Insure Place did not scale layer  
		var SB = activeDocument.activeLayer.bounds; 		// get layers bounds 
		var layerHeight = SB[3] - SB[1];					// get layers height  
		var resizePercent = (100/layerHeight)*(Size/100*doc.height.value); // Percent to resize by 
		activeDocument.activeLayer.resize(resizePercent ,resizePercent,AnchorPosition.MIDDLECENTER);  // Resize width and height by percentage 
		SB = activeDocument.activeLayer.bounds;				// get resized layers bounds  
		activeDocument.activeLayer.translate(-SB[0].value,-SB[1].value); // Move resized layer to top left canvas corner 
		var LayerWidth = (SB[2].value - SB[0].value);		// get resized layers width  
		var LayerHeight = (SB[3].value - SB[1].value);  	// get resized layers height
		marginSize = Margin/100*doc.height.value;			// Margin size
		// move resized watermark into the document lower right corner with some margin or lower left
		if  ( BottomLetf) {activeDocument.activeLayer.translate(marginSize,( doc.height.value -marginSize - LayerHeight));}
		else {activeDocument.activeLayer.translate((doc.width.value -marginSize - LayerWidth),( doc.height.value -marginSize - LayerHeight));}
	}
	catch(e) { alert(e + ': on line ' + e.line); }			// inform user of error  
	finally{  
		app.preferences.rulerUnits = strtRulerUnits;		// Restore user ruler units  
		app.preferences.typeUnits = strtTypeUnits;			// Restore user type units    
	};  
}; 
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 
function placeFile(placeFile) {  
    var desc21 = new ActionDescriptor();  
    desc21.putPath( charIDToTypeID('null'), new File(placeFile) );  
    desc21.putEnumerated( charIDToTypeID('FTcs'), charIDToTypeID('QCSt'), charIDToTypeID('Qcsa') );  
    var desc22 = new ActionDescriptor();  
    desc22.putUnitDouble( charIDToTypeID('Hrzn'), charIDToTypeID('#Pxl'), 0.000000 );  
    desc22.putUnitDouble( charIDToTypeID('Vrtc'), charIDToTypeID('#Pxl'), 0.000000 );  
    desc21.putObject( charIDToTypeID('Ofst'), charIDToTypeID('Ofst'), desc22 );  
    executeAction( charIDToTypeID('Plc '), desc21, DialogModes.NO );  
};  

Where is the problem when trying to record action? What have you tried so far, explain steps and problem.

From what I can understand you want fixed size image and you want to place logo but other parts of design are not clear to me whether other parts like text on top are fixed or not, do you have files with text and image or not... you must give us more details, before after does not help much in this case.