Create README.md

Author: JithinKS97

Diff for: p5.arrow/README.md

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+## p5.arrow
+
+Utility function for drawing arrow in p5.js
+
+![Preview](https://s2.gifyu.com/images/Peek-2021-02-08-09-27.gif)
+
+Use arrow just like you use line and specify the size of the pointer as the last parameter.
+
+Here is the code for the above visualization
+
+```
+let t=0;
+
+function setup() {
+  createCanvas(400, 400);
+}
+
+function draw() {
+  background(0);
+  translate(width/2, height/2)
+  stroke(255)
+  strokeWeight(3)
+  arrow(0,0, 100*sin(t), 100*cos(t),10)
+  t+=0.05;
+}
+```