Changes to install files for Ubuntu and added *.png to .gitignore

.gitignore

@@ -7,3 +7,4 @@ output.log
 output.mp4
 output.log
 cables-sample.zip
+*.png

install-deps.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+# change this to #!/bin/bash for windows
 
 if ! [ -d "venv" ]; then
     ./venv-setup.sh

venv-setup.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
+# change this to #!/bin/bash for windows
 
-python -m venv ./venv
+python3 -m venv ./venv
 source ./venv/bin/activate
 
 pip install --upgrade pip