Add example for Mysql client library (MySql database driver) #622 (#623)

databases/mysql/README.md

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+# mysql
+
+This RESTful Actix Web API examples illustrates how to connect to MySQL database using Mysql client library implemented in rust i.e  MySql database driver
+
+Below APIs are supported: 
+- Add Bank
+- Add Branch
+- Add Teller
+- Add Customer
+- Get Bank
+- Get Branch
+- Get Teller
+- Get Customer
+
+The RESTful Actix Web API has below listed dependencies:
+- [Actix Web](https://github.com/actix/actix-web) web framework for Rust
+- [Serde](https://github.com/serde-rs/serde) for serializing and deserializing Rust data structures
+- [MySQL](https://github.com/mysql/mysql-server) MySQL database server
+- [mysql](https://github.com/blackbeam/rust-mysql-simple) MySql database driver
+
+## Instructions
+
+### NOTE:
+
+You may need to ensure that you are running the commands with the correct MySQL user/password.
+
+1. Access MySQL Server
+
+   Log in to the MySQL Server using a user account that has the CREATE DATABASE privilege.
+
+2. Create database
+
+   ```sql
+   CREATE DATABASE my_bank;
+   ```
+
+3. Create tables in the database
+
+   Directory "mysql\sql" contains below listed ".sql" files:
+   - bankdetails.sql
+   - branch_details.sql
+   - teller_details.sql
+   - customer_details.sql
+
+   Copy the contents of each of the ".sql" and execute them separately on MySQL Server. This will create four tables in the database.
+
+4. Create `.env` file:
+
+   ```ini
+   SERVER_ADDR=127.0.0.1:8080
+   MYSQL_USER=XXX
+   MYSQL_PASSWORD=XXX
+   MYSQL_HOST=127.0.0.1
+   MYSQL_PORT=3306
+   MYSQL_DBNAME=my_bank
+   ```
+   
+   Update "MYSQL_USER" and "MYSQL_PASSWORD" values with the correct MySQL user/password.
+   If your password contains dollar sign "$", then remember to escape it eg "123$abc" will need to be changed to "123\\$abc"
+
+5. Run the server:
+
+   ```shell
+   cargo run
+   ```
+
+6. Using a different terminal send an HTTP GET/POST requests to the running server:
+
+   Directory "mysql\apis" contains below listed api's files:
+   - addbank.txt
+   - addbranch.txt
+   - addteller.txt
+   - addcustomer.txt
+   - getbank.txt
+   - getbranch.txt
+   - getteller.txt
+   - getcustomer.txt
+
+   Copy the curl request on each of the ".txt" and execute them on separate terminals. Each ".txt" contains curl request and expected json reponse data.
+