docs: update agents/rust/mediator/README.md (#1032)

Signed-off-by: Naian <[email protected]>

agents/rust/mediator/README.md

@@ -7,10 +7,8 @@ A mediator service for Aries Agents.
 ## Build
 
 This project depends on `aries-vcx` and is tightly integrated to work with it.
-As such we expect this `mediator` module to be in a subdirectory of aries-vcx repo.
-You may transplant it, but expect to change the `Cargo.toml` and adjust the dependencies on aries modules manually.
 
-When ready it's simple to build.
+When ready, it's simple to build.
 
 ```bash
 # Dev environment build
@@ -26,13 +24,21 @@ cargo run --bin mediator
 ```
 
 ```bash
-# For testing / demo purposes
+# For manual testing / demo purposes
 cargo run --package client-tui
 
 # To also see panic and debug info produced by tui
 cargo run --package client-tui 2> err || cat  err
 ```
 
+```bash
+# To run automated tests, you should have a mediator already running
+# # Terminal 1
+cargo run --bin mediator
+# # Terminal 2
+cargo test 
+```
+
 ### Configurable Options
 
 Currently the mediator reads the following environment variables.
@@ -45,10 +51,20 @@ Currently the mediator reads the following environment variables.
 
 `MYSQL_URL`: 
 - **Description**: MySQL url for the MYSQL database used for mediator persistence. 
-- **Default**: -
+- **Default**: - (This is required!)
 - **Usage**: `MYSQL_URL=mysql://admin:password1235@localhost:3306/mediator-persistence.db`
 ```
 
+### Configurable Features
+
+Mediator's Agent contains some client code, which is used for testing, and dependent crates.  
+In production, you may want to remove this. To do so, pass `--no-default-features` to cargo when building.  
+This will ensure you are not pulling in the client code.  
+
+```bash
+cargo build --package mediator --no-default-features --release
+```
+
 ## API
 
 Currently exposed endpoints.