Add schema definition for the config

.ycm_extra_conf.py

@@ -0,0 +1,35 @@
+try:
+  from ycmd.extra_conf_support import IgnoreExtraConf
+except ImportError:
+  IgnoreExtraConf = None
+
+import os.path as p
+
+PATH_TO_THIS_DIR = p.dirname( p.abspath( __file__ ) )
+
+
+def Settings( **kwargs ):
+  if kwargs[ 'language' ] == 'json':
+    return {
+      'ls': {
+        'json': {
+          'schemas': [
+            {
+              'fileMatch': [ '.vimspector.json' ],
+              'url':
+                f'file://{PATH_TO_THIS_DIR}/docs/schema/vimspector.schema.json'
+            },
+            {
+              'fileMatch': [ '.gadgets.json', '.gadgets.d/*.json' ],
+              'url':
+                f'file://{PATH_TO_THIS_DIR}/docs/schema/gadgets.schema.json'
+            }
+          ]
+        }
+      }
+    }
+
+  if IgnoreExtraConf:
+    raise IgnoreExtraConf()
+
+  return None