Update README.md

Author: Paul Johnston

README.md

@@ -3,15 +3,17 @@
 Additional support for [rules_cc](https://github.com/bazelbuild/rules_cc) in
 conjunction with [bazel-stack-vscode](https://marketplace.visualstudio.com/items?itemName=StackBuild.bazel-stack-vscode)
 
-> NOTE: this extension currently depends on an unreleased version of
-> `bazel-stack-vscode`.  This won't work for you just yet!
-
 ## Features
 
-Problem matcher for rules_cc actions:
+### Clang Compilation Database
 
-- `CppCompile`
+This extension provides a command `Bazel/C++: Generate Compilation Database`
+(`bsv.cc.compdb.generate`) that produces a file
+`${workspaceDIrectory}/compile_commmands.json`.
 
-### 1.0.0
+To setup, edit your workspace settings (search for `bsv.cc.compdb.targets`) and
+configure a list of bazel labels for the `cc_binary` or `cc_library` targets
+you'd like to be indexed.  The tool will then produce a command set for the
+transitive closure of those top-level targets.
 
-Initial release.
+Works best in conjuction with <https://marketplace.visualstudio.com/items?itemName=llvm-vs-code-extensions.vscode-clangd>.