updated readme, added git tag script

Author: mjhea0

22_git_tag.py

@@ -0,0 +1,14 @@
+import subprocess
+import sys
+
+
+if len(sys.argv) == 3:
+    tag = sys.argv[1]
+    commit = sys.argv[2]
+    command = 'git tag -a {0} {1} -m "{2}"'.format(tag, commit, tag)
+    output = subprocess.check_output(command, shell=True).decode('utf-8')
+    subprocess.call(command, shell=True)
+    subprocess.call('git push --tags', shell=True)
+else:
+    print 'usage: tag.py TAG_NAME COMMIT'
+    sys.exit(1)

readme.md

@@ -19,4 +19,6 @@
 1. **17_rewrite_git_history.md**: Backdating/Rewriting Git history (use at your own risk)
 1. **18_zipper.py**: Zip contents of a directory, adding a timestamp to the filename
 1. **19_tsv-to-csv.py**: Convert TSV to CSV
-1. **20_restore_file_from_git.py**: Restore file from Git History
+1. **20_restore_file_from_git.py**: Restore file from Git History
+1. **21_twitter_bot.py**: Twitter Bot
+1. **22_git_tag.py**: Create Git Tag based on a commit