diff --git a/main.py b/main.py
new file mode 100644
index 0000000..971b0a1
--- /dev/null
+++ b/main.py
@@ -0,0 +1,136 @@
+from github import Github
+import sys
+import re
+import base64
+import os
+
+head = '''<table>
+<tr>'''
+tail = '''
+</tr>
+</table>'''
+
+def github_login(ACCESS_TOKEN, REPO_NAME):
+    '''
+    Use Pygithub to login to the repository
+
+    Args:
+        ACCESS_TOKEN (string): github Access Token
+        REPO_NAME (string): repository name
+
+    Returns:
+        github.Repository.Repository: object represents the repo
+
+    References:
+    ----------
+    [1]https://pygithub.readthedocs.io/en/latest/github_objects/Repository.html#github.Repository.Repository
+    '''
+    g = Github(ACCESS_TOKEN)
+    repo = g.get_repo(REPO_NAME)
+    return repo
+
+def get_inputs(input_name):
+    '''
+    Get a Github actions input by name
+
+    Args:
+        input_name (str): input_name in workflow file
+
+    Returns:
+        string: action_input
+
+    References
+    ----------
+    [1] https://help.github.com/en/actions/automating-your-workflow-with-github-actions/metadata-syntax-for-github-actions#example
+    '''
+    return os.getenv('INPUT_{}'.format(input_name).upper())
+
+def generate_contributors(repo, COLUMN_PER_ROW, img_width, font_size, head_format, tail_format):
+    '''
+    Generate the contributors list using a given template
+
+    Args:
+        repo (github.Repository.Repository): object represents the repo
+        COLUMN_PER_ROW (int): number of contributors per row
+        img_width (int): width of img
+        font_size (int): font size of name
+        head_format (string): html_format for table head
+        tail_format (string): html_format for table tail
+
+    Returns:
+        string: contributors list
+    '''    
+    USER = 0
+    HEAD = head_format
+    TAIL = tail_format
+    contributors = repo.get_contributors()
+    for contributor in contributors:
+        name = contributor.name
+        avatar_url = contributor.avatar_url
+        html_url = contributor.html_url
+        if re.match('https://github.com/apps/', html_url):
+            continue
+        if name == None:
+            name = html_url[19:]
+        if USER >= COLUMN_PER_ROW:
+            new_tr = '''\n</tr>\n<tr>'''
+            HEAD = HEAD + new_tr
+            USER = 0
+        td = f'''
+    <td align="center">
+        <a href={html_url}>
+            <img src={avatar_url} width="{img_width};" alt={name}/>
+            <br />
+            <sub style="font-size:{font_size}px"><b>{name}</b></sub>
+        </a>
+    </td>'''
+        HEAD = HEAD + td
+        USER += 1
+    HEAD = HEAD + TAIL
+    return HEAD
+
+
+def write_contributors(repo, contributors_list, path, commit_message, CONTRIB):
+    '''
+    Write contributors list to file if it differs
+
+    Args:
+        repo (github.Repository.Repository): object represents the repo
+        contributors_list (string): contributors list
+        path (string): the file to write
+        commit_message (string): commit message
+        CONTRIB (string): where you want to write the contributors list
+    '''
+    contents = repo.get_contents(path)
+    base = contents.content
+    base = base.replace('\n', '')
+    text = base64.b64decode(base).decode('utf-8')
+    str = text.split(CONTRIB)
+    if re.match(head, str[1]):
+        end = str[1].split(tail)
+        end[0] = end[0] + tail
+    else:
+        end = ['', str[1]]
+    if end[0] != contributors_list:
+        end[0] = contributors_list
+        text = str[0] + CONTRIB + end[0] + end[1]
+        repo.update_file(contents.path, commit_message, text, contents.sha)
+    else:
+        pass
+
+def main():
+    ACCESS_TOKEN = get_inputs('ACCESS_TOKEN')
+    REPO_NAME = get_inputs('REPO_NAME')
+    CONTRIB = get_inputs('CONTRIB') + '\n\n'
+    COLUMN_PER_ROW = int(get_inputs('COLUMN_PER_ROW'))
+    IMG_WIDTH = int(get_inputs('IMG_WIDTH'))
+    FONT_SIZE = int(get_inputs('FONT_SIZE'))
+    PATH = get_inputs('PATH')
+    COMMIT_MESSAGE = get_inputs('COMMIT_MESSAGE')
+    repo = github_login(ACCESS_TOKEN, REPO_NAME)
+    CONTRIBUTORS_LIST = generate_contributors(repo, COLUMN_PER_ROW, IMG_WIDTH, FONT_SIZE, head, tail)
+    write_contributors(repo, CONTRIBUTORS_LIST, PATH, COMMIT_MESSAGE, CONTRIB)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..ec92b1f
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,13 @@
+certifi==2020.6.20
+cffi==1.14.0      
+chardet==3.0.4    
+cryptography==3.0
+Deprecated==1.2.10
+idna==2.10
+pycparser==2.20
+PyGithub==1.51
+PyJWT==1.7.1
+requests==2.24.0
+six==1.15.0
+urllib3==1.25.10
+wrapt==1.11.2
\ No newline at end of file