add materials (mat) files and readme.md

valve/sprites/rjet1.spr/rjet1.spr.mat

@@ -0,0 +1,25 @@
+
+{
+"for" "#sprites/rjet1(frame:00).spr"
+"basecolor_map" "Frame 0.png"
+}
+
+{
+"for" "#sprites/rjet1(frame:01).spr"
+"basecolor_map" "Frame 1.png"
+}
+
+{
+"for" "#sprites/rjet1(frame:02).spr"
+"basecolor_map" "Frame 2.png"
+}
+
+{
+"for" "#sprites/rjet1(frame:03).spr"
+"basecolor_map" "Frame 3.png"
+}
+
+{
+"for" "#sprites/rjet1(frame:04).spr"
+"basecolor_map" "Frame 4.png"
+}