[v3] Add key features #83 (#116)

* Adding key_features

* Fix lint issues

* Update config.json

Co-authored-by: Sascha Mann <git@mail.saschamann.eu>

Co-authored-by: Sascha Mann <git@mail.saschamann.eu>

config.json

@@ -32,7 +32,38 @@
     "runtime/language_specific",
     "used_for/scientific_calculations"
   ],
-  "key_features": [],
+  "key_features": [
+    {
+      "icon": "TODO",
+      "title": "Scientific computing",
+      "content": "Fortran is used heavily in scientific computing and engineering."
+    },
+    {
+      "icon": "TODO",
+      "title": "Cross-platform",
+      "content": "Fortran is portable and can run on almost any platform."
+    },
+    {
+      "icon": "TODO",
+      "title": "Performant",
+      "content": "Fortran has been consistently rated as one of the highest performing languages for energy and time."
+    },
+    {
+      "icon": "TODO",
+      "title": "Stable",
+      "content": "The Fortran values stability and backwards compatibility, Fortran programs can run for decades."
+    },
+    {
+      "icon": "TODO",
+      "title": "Math",
+      "content": "The name of Fortran derived from Formula Translation. Natively supports arrays and complex numbers."
+    },
+    {
+      "icon": "TODO",
+      "title": "Efficient",
+      "content": "Fortran has been optimized for decades to execute efficiently."
+    }
+  ],
   "concepts": [],
   "exercises": {
     "concept": [],