differentiate numerical imm and label imm,

implement assembler,
add binary file outputs to gitignore,
add development container for assembler

.devcontainer/Dockerfile

@@ -0,0 +1,6 @@
+FROM python:slim
+WORKDIR /
+RUN apt-get -y update; apt-get -y upgrade
+RUN apt-get -y install git binutils
+COPY requirements.txt .
+RUN pip install -r requirements.txt

.devcontainer/devcontainer.json

@@ -0,0 +1,30 @@
+{
+    "name": "cse141L development container",
+    "build": {
+		"dockerfile": "Dockerfile",
+    },
+    "settings": { 
+		"terminal.integrated.shell.linux": "/bin/bash",
+		"python.pythonPath": "/usr/local/bin/python",
+		"python.linting.enabled": true,
+		"python.linting.pylintEnabled": true,
+		"python.formatting.autopep8Path": "/usr/local/py-utils/bin/autopep8",
+		"python.formatting.blackPath": "/usr/local/py-utils/bin/black",
+		"python.formatting.yapfPath": "/usr/local/py-utils/bin/yapf",
+		"python.linting.banditPath": "/usr/local/py-utils/bin/bandit",
+		"python.linting.flake8Path": "/usr/local/py-utils/bin/flake8",
+		"python.linting.mypyPath": "/usr/local/py-utils/bin/mypy",
+		"python.linting.pycodestylePath": "/usr/local/py-utils/bin/pycodestyle",
+		"python.linting.pydocstylePath": "/usr/local/py-utils/bin/pydocstyle",
+		"python.linting.pylintPath": "/usr/local/bin/pylint",
+		"python.testing.pytestPath": "/usr/local/py-utils/bin/pytest",
+    "editor.tabSize": 4,
+    "editor.insertSpaces": false
+	},
+	"extensions": [
+		"mhutchie.git-graph",
+		"ms-python.python",
+		"waderyan.gitblame"
+	],
+		"postCreateCommand": ""
+	}

.devcontainer/requirements.txt

@@ -0,0 +1 @@
+tqdm