Add general maintainers role for astropy core package

Author: hamogu

roles.json

@@ -395,7 +395,24 @@
         }
     },
     {
-        "role": "Sub-package maintainer",
+        "role": "Core astropy package maintainer (general)",
+        "url": "Core_package_general_maintainer",
+        "people": [
+            "unfilled"
+        ],
+        "role-head": "Core astropy package maintainer (general)",
+        "responsibilities": {
+            "description": "Maintain the astropy core package in aspects that are not specific to a single sub-package",
+            "details": [
+                "Evaluating new pull requests for quality, API consistency, Astropy coding standards, and appropriateness within the overall astropy ecosystem, in particular for pull requests spanning multiple sub-packages",
+                "Merging Pull Requests",
+                "Maintain, review, and advocate for useful interaction between multiple sub-packages", 
+                "Keeping track of frequent contributors and their relevant areas of expertise"
+            ]
+        }
+    },
+    {
+        "role": "Core astropy package maintainer (sub-package)",
         "url": "Subpackage_maintainer",
         "role-head": "Sub-package maintainer (at least one per core package sub-package)",
         "sub-roles": [
@@ -420,6 +437,7 @@
                     "Stuart Littlefair",
                     "Adrian Price-Whelan",
                     "Erik Tollerud",
+                    "Eero Vaher",
                     "Marten van Kerkwijk"
                 ]
             },