Update README.md

README.md

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-# MigrateGitlabToGogs
+# Migration utility for moving from Gitlab to Gogs / Gitea
-Python tool to automate the migration of repositories from gitlab to gogs / gitea
+
+This tools provides an automated way to copy whole namespaces from Gitlab to Gogs / Gitea. 
+All tags and branches are copied. 
+Organizations are supported as well. 
+
+## Usage
+
+Type `python migrate_gitlab_to_gogs.py --help` for usage information. 
+It will print 
+```
+usage: migrate_gitlab_to_gogs.py [-h] --source_namespace SOURCE_NAMESPACE
+                                 [--add_to_private]
+                                 [--add_to_organization organization_name]
+                                 --source_repo SOURCE_REPO --target_repo
+                                 TARGET_REPO
+
+optional arguments:
+  -h, --help            show this help message and exit
+  --source_namespace SOURCE_NAMESPACE
+                        The namespace in gitlab as it appears in URLs. For
+                        example, given the repository address
+                        http://mygitlab.com/harry/my-awesome-repo.git, it
+                        shows that this repository lies within my personal
+                        namespace "harry". Hence I would pass harry as
+                        parameter.
+  --add_to_private      If you want to add the repositories under your own
+                        name, ie. not in any organisation, use this flag.
+  --add_to_organization organization_name
+                        If you want to add all the repositories to an
+                        exisiting organisation, please pass the name to this
+                        parameter. Organizations correspond to groups in
+                        Gitlab. The name can be taken from the URL, for
+                        example, if your organization is http://mygogs-
+                        repo.com/org/my-awesome-organisation/dashboard then
+                        pass my-awesome-organisation here
+  --source_repo SOURCE_REPO
+                        URL to your gitlab repo in the format
+                        http://mygitlab.com/
+  --target_repo TARGET_REPO
+                        URL to your gogs / gitea repo in the format
+                        http://mygogs.com/
+```
+
+## Requirements
+This tools was written for Python 3 using the requests, json, subprocess, and argparse modules.