Doc 2542 - Add code examples for the Geospatial tutorial (#2585)

* DOC-2542 Add code examples for the Geospatial tutorial

* adds spaces after properties in objects

---------

Co-authored-by: Justin Castilla <pxlperfection@gmail.com>

doctests/dt-geo.js

@@ -0,0 +1,59 @@
+// EXAMPLE: geo_tutorial
+// HIDE_START
+import assert from 'assert';
+import { createClient } from 'redis';
+
+const client = createClient();
+await client.connect();
+// HIDE_END
+
+// REMOVE_START
+await client.del('bikes:rentable')
+// REMOVE_END
+
+// STEP_START geoAdd
+const res1 = await client.geoAdd('bikes:rentable', { 
+  longitude: -122.27652,
+  latitude: 37.805186,
+  member: 'station:1'
+});
+console.log(res1)  // 1
+
+const res2 = await client.geoAdd('bikes:rentable', {
+  longitude: -122.2674626,
+  latitude: 37.8062344,
+  member: 'station:2'
+});
+console.log(res2)  // 1
+
+const res3 = await client.geoAdd('bikes:rentable', {
+  longitude: -122.2469854,
+  latitude: 37.8104049,
+  member: 'station:3'
+})
+console.log(res3)  // 1
+// STEP_END
+
+// REMOVE_START
+assert.equal(res1, 1);
+assert.equal(res2, 1);
+assert.equal(res3, 1);
+// REMOVE_END
+
+// STEP_START geoSearch
+const res4 = await client.geoSearch(
+  'bikes:rentable', {
+    longitude: -122.27652,
+    latitude: 37.805186,
+  },
+  { radius: 5,
+    unit: 'km'
+  }
+);
+console.log(res4)  // ['station:1', 'station:2', 'station:3']
+// STEP_END
+
+// REMOVE_START
+assert.deepEqual(res4, ['station:1', 'station:2', 'station:3']);
+// REMOVE_END
+await client.quit()