Added package constants (#1159)

packages.json

@@ -14213,5 +14213,21 @@
     "description": "Blitz3D-esque DX9 engine for Nim",
     "license": "MIT",
     "web": "https://github.com/Guevara-chan/Xors3D-for-Nim"
+  },
+  {
+    "name": "constants",
+    "url": "https://github.com/juancarlospaco/nim-constants",
+    "method": "git",
+    "tags": [
+      "math",
+      "physics",
+      "chemistry",
+      "biology",
+      "engineering",
+      "science"
+    ],
+    "description": "Mathematical numerical named static constants useful for different disciplines",
+    "license": "MIT",
+    "web": "https://github.com/juancarlospaco/nim-constants"
   }
 ]