Start: Add shell script

Same as the batch file. Also edit the python script to work when
a venv is clean.

Signed-off-by: kingbri <bdashore3@proton.me>

start.sh

@@ -1,5 +1,19 @@
 #!/bin/bash
-cd "$(dirname "$0")"
-source ./venv/bin/activate
-pip -V
-python main.py
+
+cd "$(dirname "$0")" || exit
+
+if [ -n "$CONDA_PREFIX" ]; then
+    echo "It looks like you're in a conda environment. Skipping venv check."
+else
+    if [ ! -d "venv" ]; then
+        echo "Venv doesn't exist! Creating one for you."
+        python3 -m venv venv
+    fi
+
+    echo "Activating venv"
+
+    # shellcheck source=/dev/null
+    source venv/bin/activate
+fi
+
+python3 start.py "$@"