add 2DMatpedia to the providers, with a static index meta-db

src/index-metadbs/twodmatpedia/v1/info.json

@@ -0,0 +1,42 @@
+{
+   "meta" : {
+       "api_version" : "1.0.0",
+       "query" : {
+           "representation" : "/info"
+       },
+       "more_data_available" : false,
+       "schema" : "https://schemas.optimade.org/openapi/v1.0/optimade_index.json"
+   },
+   "data" : {
+      "attributes" : {
+         "available_api_versions" : [
+            {
+               "version" : "1.0.0",
+               "url" : "http://providers.optimade.org/index-metadbs/twodmatpedia/v1/"
+            }
+         ],
+         "is_index" : true,
+         "formats" : [
+            "json"
+         ],
+         "entry_types_by_format" : {
+            "json" : []
+         },
+         "available_endpoints" : [
+            "info",
+            "links"
+         ],
+         "api_version" : "1.0.0"
+      },
+      "type" : "info",
+      "relationships" : {
+         "default" : {
+            "data" : {
+               "id" : "twodmatpedia",
+               "type" : "links"
+            }
+         }
+      },
+      "id" : "/"
+   }
+}

src/index-metadbs/twodmatpedia/v1/links.json

@@ -0,0 +1,34 @@
+{
+   "meta" : {
+       "api_version" : "1.0.0",
+       "query" : {
+           "representation" : "/links"
+       },
+       "more_data_available" : false,
+       "schema" : "https://schemas.optimade.org/openapi/v1.0/optimade_index.json"
+   },
+   "data" : [
+      {
+         "id" : "twodmatpedia",
+         "type" : "links",
+         "attributes" : {
+            "name": "2DMatpedia",
+            "description": "2DMatpedia, an open computational database of two-dimensional materials from top-down and bottom-up approaches",
+            "base_url": "http://optimade.2dmatpedia.org",
+            "homepage": "http://2dmatpedia.org",
+            "link_type": "child"
+         }
+      },
+      {
+         "id" : "optimade-providers",
+         "type" : "links",
+         "attributes" : {
+            "name": "OPTIMADE Providers Index Meta-Database",
+            "description": "The list of OPTIMADE providers maintained by Materials-Consortia",
+            "base_url": "https://providers.optimade.org",
+            "homepage": "https://www.optimade.org",
+            "link_type": "providers"
+         }
+      }
+   ]
+}

src/links/v1/providers.json

@@ -205,6 +205,17 @@
         "homepage": "https://www.crystallography.net/tcod",
         "link_type": "external"
       }
+    },
+    {
+      "type": "links",
+      "id": "twodmatpedia",
+      "attributes": {
+        "name": "2DMatpedia",
+        "description": "2DMatpedia, an open computational database of two-dimensional materials from top-down and bottom-up approaches",
+        "base_url": "http://providers.optimade.org/index-metadbs/twodmatpedia",
+        "homepage": "http://2dmatpedia.org",
+        "link_type": "external"
+      }
     }
   ]
 }