„Usage“ hinzufügen

Usage.md

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+# Usage
+
+Simple logger function with colored LogLevel designed to run inside Docker container
+
+Debug can be enabled by setting the environment variable
+
+> **DEBUG_MODE** = *True*
+
+```python
+# Usage with os only necessary if environment variable has not been set before (e.g. outside Docker)
+import os
+os.environ['DEBUG_MODE'] = 'True' # A unset DEBUG_MODE Varibale or with value 'False' will prevent printing Debug Log 
+
+from loghandler import logger
+
+def main():
+    logger.debug("This is a Debug Message")
+    logger.info("This is a Info Message")
+    logger.warning("This is a Warning Message")
+    logger.error("This is a Error Message")
+    logger.critical("This is a Critical Message")
+
+main()
+```
+
+```
+[Fri, 06 Aug 2021 13:36:09] DEBUG [test.py.main:7] This is a Debug Message
+[Fri, 06 Aug 2021 13:36:09] INFO [test.py.main:8] This is a Info Message
+[Fri, 06 Aug 2021 13:36:09] WARNING [test.py.main:9] This is a Warning Message
+[Fri, 06 Aug 2021 13:36:09] ERROR [test.py.main:10] This is a Error Message
+[Fri, 06 Aug 2021 13:36:09] CRITICAL [test.py.main:11] This is a Critical Message
+```