Add steering part of rc-car

.gitignore

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+# lets ignore slt and gcode models
+*.stl
+*.gcode

rc-car/steering-engine.scad

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+translate([0,0,0]) {
+//    cube([4.5,4.5,38], center=true);
+//     cylinder(10);
+//    circle(r = 10);
+}
+
+translate([0,0,-2]) {
+  union() {
+    difference() {
+      cylinder( d = 10, h = 4);
+      cylinder( d = 6, h = 4);
+    }
+  }
+}
+translate([14,0,0]) {
+    cube([20,4,4], center=true);
+}
+
+rotate([90,0,0]) {
+  translate([27,0,-2]) {
+    union() {
+      difference() {
+        cylinder( d = 10, h = 4);
+        cylinder( d = 6, h = 4);
+      }
+    }
+  }
+}