feat: add fpm.toml schema validation

Fixes #654

Author: gnikit

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Added support for schema validation of `fpm.toml` files.
 - Added local path resolution for `fortls`, `findent` and `fprettify` executables
   ([#667](https://github.com/fortran-lang/vscode-fortran-support/issues/667))
 - Added support for variable resolution in `fortls`

package.json

@@ -110,6 +110,12 @@
         }
       }
     ],
+    "tomlValidation": [
+      {
+        "fileMatch": "fpm.toml",
+        "url": "https://github.com/fortran-lang/fpm-metadata/releases/download/v0.2.1/fpm-metadata-0.2.1.json"
+      }
+    ],
     "grammars": [
       {
         "language": "FortranFreeForm",