Added code that actually adds an image texture.

ImageTextureTrial2.py

@@ -0,0 +1,22 @@
+# Link to the code from StackExchange: https://blender.stackexchange.com/questions/157531/blender-2-8-python-add-texture-image
+
+#Import python
+import bpy
+from bpy import context, data, ops
+
+
+mat = bpy.data.materials.new(name="New_Mat")
+mat.use_nodes = True
+bsdf = mat.node_tree.nodes["Principled BSDF"]
+texImage = mat.node_tree.nodes.new('ShaderNodeTexImage')
+texImage.image = bpy.data.images.load("C:\\Users\\satna\\OneDrive\\Desktop\\Programming\\Python\\Blender\\Blender-World-Generator\\DirtBlock.png")
+mat.node_tree.links.new(bsdf.inputs['Base Color'], texImage.outputs['Color'])
+
+ob = context.view_layer.objects.active
+
+# Assign it to object
+if ob.data.materials:
+    ob.data.materials[0] = mat
+else:
+    ob.data.materials.append(mat)
+

Trial.py

@@ -8,9 +8,9 @@ size = 1;
 # Setting the x, y, and z positions.
 x = y = z = size / 2;  
 # Setting the number of cubes in each coordinate. 
-xNum = 20;
+xNum = 3;
-yNum = 20;
+yNum = 3;
-zNum = 1;
+zNum = 3;
 # Setting the initial value for the number of cubes in each recursive call. 
 cubeCount = 0;
 # Setting the maximum amount of cubes that is needed to be created. 
@@ -72,3 +72,4 @@ spawnGround();
 # - I need to add the materials to the cubes and somehow save it in the Blender program. 
 # - I need to replace the nested for loop with a recursive function to spawn the ground. 
 # - I need to add a function to create a tree in a random position. This function will create cubes and put them in a way to look like a tree. It will also assign the correct materials to their proper cubes. 
+# - I need to find a way to create creat and assign a single material to all the respective cubes.