Update README with how to add item and credits

Signed-off-by: ehanoc <[email protected]>

README.md

@@ -17,4 +17,23 @@ The radar is reviewed monthly by the ATAC (Algorand Technical Adoption Comittee)
 
 Items being moved from **HOLD** to other quadrants are done so by voting by the ATAC's members. 
 
-The group will accept pull requests to add new items to the radar. New items will be added to the **HOLD** quadrant and will be reviewed by the ATAC in the next monthly meeting.
+The group will accept pull requests to add new items to the radar. New items will be added to the **HOLD** quadrant and will be reviewed by the ATAC in the next monthly meeting.
+
+## How to add a new item
+
+To add a new item to the radar, please create a pull request where you add a new entry to the config.json file. The entry should be in the following format: 
+
+```json
+    {
+      "quadrant": 0, // 0 == Projects, 1 == Infrastructure, 2 == ARCS, 3 == Standards & Techniques
+      "ring": 1, // 0 == Adopt, 1 == Trial, 2 == Assess, 3 == Hold
+      "label":"Algorand Extension API provider", // Name of the item
+      "link": "https://github.com/algorand/js-algorand-sdk", // Link to the item
+      "active": true, // Not doing much atm
+      "moved": 0 // 0 == Not moved and shows as a circle, 1 == Moved and shows as a triangle
+    }
+```
+
+#### Credits
+
+This project is based on the [Zalando Tech Radar](https://github.com/zalando/tech-radar), which in turn is inspired by [ThoughtWorks Radar](https://www.thoughtworks.com/radar).