add readme.md

README.me

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+
+# BillMan
+
+ - Daily AWS consumption reporter w/ slack
+
+# installation
+```
+$ python3 -m venv --clear venv
+$ source ./venv/bin/activate 
+$ pip install -r requirements.txt
+```
+
+# instructions
+
+ - settings file -> see `bill_man.json.example`
+ - run
+    ```
+    $ source ./venv/bin/activate 
+    $ python bill_man.py start
+    ```
+ - stop
+    ```
+    $ source ./venv/bin/activate 
+    $ python bill_man.py stop
+    ```