chore: update e2e readme (#286)

Signed-off-by: Allain Magyar <allain.magyar@iohk.io>

integration-tests/e2e-tests/README.md

@@ -1,6 +1,10 @@
 # Wallet SDK - Typescript E2E
 
-How to use
+## How to run
+
+This guide shows you how to run the end-to-end tests
+
+### Setting up the environment variables
 
 - Copy `.env.example` to `.env`
 - Fill the required properties
@@ -9,7 +13,34 @@ How to use
 | ------------------------ | ----------------------------------------------------------- |
 | MEDIATOR_OOB_URL         | URL that returns the OOB url                                |
 | AGENT_URL                | URL for Cloud Agent - should end with a forward slash ("/") |
-| APIKEY                   | Apikey authentication                                       |
-| PUBLISHED_DID            | Existing DID                                                |
-| JWT_SCHEMA_GUID          | Existing jwt schema guid                                    |
-| ANONCRED_DEFINITION_GUID | Existing anoncred definition guid                           |
+| APIKEY                   | (Optional) Apikey authentication                            |
+| PUBLISHED_DID            | (Optional) Existing DID                                     |
+| JWT_SCHEMA_GUID          | (Optional) Existing jwt schema guid                         |
+| ANONCRED_DEFINITION_GUID | (Optional) Existing anoncred definition guid                |
+
+### Compile the SDK
+
+To test the changes you'll need to build the SDK. Refer to [README](/../../README.md#building-from-source) for
+further instructions.
+
+### Installing dependencies
+
+```bash
+yarn install
+```
+
+### Running the tests
+
+To run the full end-to-end regression test suite
+
+```bash
+yarn test:sdk
+```
+
+To run a specific tagged scenario
+
+```bash
+yarn test:sdk --tags "@mytag and @anothertag"
+```
+
+After the execution is done, it will generate the report inside the `target` folder.