Import mega api key from config.env file

Signed-off-by: lzzy12 <jhashivam2020@gmail.com>

README.md

@@ -60,6 +60,7 @@ Fill up rest of the fields. Meaning of each fields are discussed below:
 - **API_KEY** : This is to authenticate to your telegram account for downloading Telegram files. You can get this from https://my.telegram.org DO NOT put this in quotes.
 - **API_HASH** : This is to authenticate to your telegram account for downloading Telegram files. You can get this from https://my.telegram.org
 - **USER_SESSION_STRING** : Session string generated by running:
+- **MEGA_API_KEY**: Mega.nz api key to mirror mega.nz links. Get it from [Mega SDK Page](https://mega.nz/sdk)
 ```
 python3 generate_string_session.py
 ```

bot/__init__.py

@@ -79,6 +79,12 @@ try:
 except KeyError as e:
     LOGGER.error("One or more env variables missing! Exiting now")
     exit(1)
+
+try:
+    MEGA_API_KEY = getConfig('MEGA_API_KEY')
+except KeyError:
+    logging.warning('MEGA Api key not provided!')
+    MEGA_API_KEY = None
 try:
     INDEX_URL = getConfig('INDEX_URL')
     if len(INDEX_URL) == 0: