readme updates and env file clarification (#219)

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

Author: nadineloepfe

.env.example

@@ -1,10 +1,11 @@
-OPERATOR_ID=<YOUR_OPERATOR_ID>
-OPERATOR_KEY=<YOUR_PRIVATE_KEY>
-RECIPIENT_ID=<RECIPIENT_ID>
-RECIPIENT_KEY=<RECIPIENT_KEY>
-ADMIN_KEY=<ADMIN_KEY>
-TOKEN_ID=<TOKEN_ID>
-TOKEN_NAME=<TOKEN_NAME>
-TOKEN_SYMBOL=<TOKEN_SYMBOL>
-TOPIC_ID=<TOPIC_ID>
-NETWORK=<NETWORK>
+OPERATOR_ID=<YOUR_OPERATOR_ID> #your private key, can be retrived from https://portal.hedera.com/dashboard
+OPERATOR_KEY=<YOUR_PRIVATE_KEY> # your account id, can be retrieved from https://portal.hedera.com/dashboard
+NETWORK=<NETWORK> #eg testnet/previewnet/mainnet
+
+# RECIPIENT_ID=<RECIPIENT_ID> #optional
+# RECIPIENT_KEY=<RECIPIENT_KEY>  #optional
+# ADMIN_KEY=<ADMIN_KEY>  #optional
+# TOKEN_ID=<TOKEN_ID>  #optional
+# TOKEN_NAME=<TOKEN_NAME>  #optional
+# TOKEN_SYMBOL=<TOKEN_SYMBOL>  #optional
+# TOPIC_ID=<TOPIC_ID>  #optional

README.md

@@ -100,16 +100,20 @@ Create a .env file in the root of your project with the following (replace with
 ```
 OPERATOR_ID=0.0.1234xx
 OPERATOR_KEY=af20e47d590300506032b657004220420...
+NETWORK=testnet
+
+# optional:
 ADMIN_KEY=af20e47d59032b65700321009308ecfdf...
 SUPPLY_KEY =302a300506032b6570032100c5e4af5..."
 FREEZE_KEY=302a300306072b65700321009308ecfdf...
 RECIPIENT_ID=0.0.789xx
 TOKEN_ID=0.0.100xx
 TOPIC_ID=0.0.200xx
 FREEZE_ACCOUNT_ID=0.0.100
-NETWORK=testnet
 ```
 
+The only environment variables needed are OPERATOR_ID, OPERATOR_KEY and NETWORK. The rest is optional (if customisation of the example scripts is needed).
+
 A [sample .env](.env.example) file is provided in the root of this project. If you do not have an account on
 the Hedera testnet, you can easily get one from the [Hedera Portal](https://portal.hedera.com/). Learn more about
 testnet [here](https://docs.hedera.com/guides/testnet).