Add web instructions for drift

Author: mugikhan

packages/drift_sqlite_async/README.md

@@ -3,12 +3,12 @@
 `drift_sqlite_async` allows using drift on an sqlite_async database - the APIs from both can be seamlessly used together in the same application.
 
 Supported functionality:
+
 1. All queries including select, insert, update, delete.
 2. Transactions and nested transactions.
 3. Table updates are propagated between sqlite_async and Drift - watching queries works using either API.
 4. Select queries can run concurrently with writes and other select statements.
 
-
 ## Usage
 
 Use `SqliteAsyncDriftConnection` to create a DatabaseConnection / QueryExecutor for Drift from the sqlite_async SqliteDatabase:
@@ -59,4 +59,24 @@ These events are only sent while no write transaction is active.
 
 Within Drift's transactions, Drift's own update notifications will still apply for watching queries within that transaction.
 
-Note: There is a possibility of events being duplicated. This should not have a significant impact on most applications.
+Note: There is a possibility of events being duplicated. This should not have a significant impact on most applications.
+
+## Web
+
+Note: Web support is currently in Beta.
+
+Web support requires Sqlite3 WASM and web worker Javascript files to be accessible. These file need to be put into the `web/` directory of your app.
+
+The compiled web worker files can be found in our Github [releases](https://github.com/powersync-ja/sqlite_async.dart/releases)
+The `sqlite3.wasm` asset can be found [here](https://github.com/simolus3/sqlite3.dart/releases)
+
+In the end your `web/` directory will look like the following
+
+```
+web/
+├── favicon.png
+├── index.html
+├── manifest.json
+├── db_worker.js
+└── sqlite3.wasm
+```