Add setup.py and .gitignore

Summary:
Install `facto` in your virtual environment by running:
```
python3 setup.py install
```

Once installed, you'll be able to import inputgen and specdb
```
from facto import inputgen
from facto import specdb
```

Reviewed By: zonglinpeng

Differential Revision: D68641949

fbshipit-source-id: 0a6aafedd0910ea38685d1340d16738cd7fbe1fc

Author: manuelcandales

.gitignore

@@ -0,0 +1,21 @@
+# Python build artifacts
+__pycache__/
+*.py[cod]
+*.pyo
+*.pyd
+*.so
+
+# Setuptools build directories
+build/
+dist/
+*.egg-info/
+*.egg
+
+# Virtual environments (if any)
+env/
+.venv/
+venv/
+
+# System-specific files
+.DS_Store
+Thumbs.db

README.md

@@ -12,13 +12,20 @@ Here is an [overview](inputgen/overview.md) of InputGen
 
 SpecDB is a [database](specdb/db.py#L30) of specifications covering most of the Core ATen Ops. They have been developed using the ATen CPU kernels as a reference.
 
+## Instalation
+```
+git clone https://github.com/pytorch-labs/FACTO.git
+cd FACTO
+python3 setup.py install
+```
+
 ## Example Usage
 
 The code below is a minimal example to test add.Tensor using FACTO.
 ```python
 import torch
-from inputgen.argtuple.gen import ArgumentTupleGenerator
-from specdb.db import SpecDictDB
+from facto.inputgen.argtuple.gen import ArgumentTupleGenerator
+from facto.specdb.db import SpecDictDB
 
 # Retrieve the specification from SpecDB
 spec = SpecDictDB["add.Tensor"]

facto/__init__.py

@@ -0,0 +1,19 @@
+from setuptools import find_packages, setup
+
+setup(
+    name="facto",
+    version="0.1.0",
+    author="Manuel Candales",
+    description="Framework for Algorithmic Correctness Testing of Operators",
+    long_description=open("README.md").read(),
+    long_description_content_type="text/markdown",
+    url="https://github.com/pytorch-labs/FACTO",
+    packages=find_packages(include=["facto", "facto.*"]),
+    classifiers=[
+        "Programming Language :: Python :: 3",
+        "License :: OSI Approved :: BSD 3-Clause License",
+        "Operating System :: OS Independent",
+    ],
+    python_requires=">=3.8",
+    install_requires=["torch"],
+)