doc: add README file

mithril-client-wasm/www-test/README.md

@@ -0,0 +1,29 @@
+# Mithril client wasm: www-test
+
+* A set of tests for the Mithril client WASM library, which is a client for interacting with a Mithril network. The tests cover functionalities provided by the MithrilClient class.
+
+## Download source code
+
+```bash
+# Download sources from github
+git clone https://github.com/input-output-hk/mithril
+
+# Go to sources directory
+cd mithril-client-wasm/
+```
+
+* Before running the tests, make sure to install the required dependencies. Use the following command:
+
+```bash
+make www-test-install
+```
+
+## Running the tests in the browser
+
+```bash
+make www-test-serve
+```
+
+## Test Results Display
+
+The results of each test are displayed in the DOM dynamically. Open [http://localhost:8080](http://localhost:8080) with your browser. (port 8080 is the default port)