Added shell scripts

shell/format.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+isort --sl demo/src/ demo/app.py
+black --line-length 160 demo/src/ demo/app.py
+flake8 demo/src/ demo/app.py

shell/lint.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+isort --check --sl -c demo/src/ demo/app.py
+if ! [ $? -eq 0 ]
+then
+  echo "Please run \"sh shell/format.sh\" to format the code."
+  exit 1
+fi
+echo "no issues with isort"
+flake8 demo/src/ demo/app.py
+if ! [ $? -eq 0 ]
+then
+  echo "Please fix the code style issue."
+  exit 1
+fi
+echo "no issues with flake8"
+black --check --line-length 160 demo/src/ demo/app.py
+if ! [ $? -eq 0 ]
+then
+  echo "Please run \"sh shell/format.sh\" to format the code."
+    exit 1
+fi
+echo "no issues with black"
+echo "linting success!"