* Adding scope mapping configuration manifest in `package.json`

* Loading configurable scope mappings from settings.
* Updating Readme with `rust-analyzer.scopeMappings`.
`rust-analyzer.scopeMappings` -- a scheme backed JSON object to tweak Rust Analyzer scopes to TextMate scopes.
   ```jsonc
    {
        //Will autocomplete keys to available RA scopes.
        "keyword.unsafe": ["keyword", "keyword.control"],
        //Values are string | TextMateScope | [string | TextMateScope]
        "comments": "comment.block"
    }
   ```

1 files changed, 63 insertions, 1 deletions

diff --git a/editors/code/package.json b/editors/code/package.json
index ee997e58f..35f2f1e62 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -167,6 +167,68 @@
                     "default": false,
                     "description": "Highlight Rust code (overrides built-in syntax highlighting)"
                 },
+                "rust-analyzer.scopeMappings": {
+                    "type": "object",
+                    "definitions": {},
+                    "properties": {
+                        "comment": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "string": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "keyword": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "keyword.control": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "keyword.unsafe": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "function": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "parameter": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "constant": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "type": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "builtin": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "text": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "attribute": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "literal": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "macro": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "variable": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "variable.mut": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "field": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        },
+                        "module": {
+                            "$ref": "vscode://schemas/textmate-colors#/items/properties/scope"
+                        }
+                    },
+                    "additionalProperties": false,
+                    "description": "Mapping Rust Analyzer scopes to TextMateRule scopes list."
+                },
                 "rust-analyzer.rainbowHighlightingOn": {
                     "type": "boolean",
                     "default": false,
@@ -488,4 +550,4 @@
             }
         ]
     }
-}
+}
\ No newline at end of file