* 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, 11 insertions, 2 deletions

diff --git a/docs/user/README.md b/docs/user/README.md
index eb1d5ed14..42742c0e6 100644
--- a/docs/user/README.md
+++ b/docs/user/README.md
@@ -82,7 +82,16 @@ host.
 
 ### Settings
 
-* `rust-analyzer.highlightingOn`: enables experimental syntax highlighting
+* `rust-analyzer.highlightingOn`: enables experimental syntax highlighting.
+* `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"
+    }
+   ```
 * `rust-analyzer.enableEnhancedTyping`: by default, rust-analyzer intercepts
   `Enter` key to make it easier to continue comments. Note that it may conflict with VIM emulation plugin.
 * `rust-analyzer.raLspServerPath`: path to `ra_lsp_server` executable
@@ -101,7 +110,7 @@ host.
 * `rust-analyzer.trace.cargo-watch`: enables cargo-watch logging
 * `RUST_SRC_PATH`: environment variable that overwrites the sysroot
 * `rust-analyzer.featureFlags` -- a JSON object to tweak fine-grained behavior:
-   ```js
+   ```jsonc
    {
        // Show diagnostics produced by rust-analyzer itself.
        "lsp.diagnostics": true,