Add git tips

Author: svetlana-v

README.md

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 ## Domains
 * [Natural Language Processing](nlp)
 * [Structured Data](structured_data)
-* [Machine Learning in Production](mlip)
+* [Machine Learning in Production](mlip)
+* [Software Architecture](sa)

sa/README.md

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+# ML6 Software Architecture Quick Tips
+
+Current content:

sa/git_tips/README.md

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+# Using Git in our daily workflow
+
+Git is an essential tool in our day-to-day coding life. Below you will find Git hints and best 
+practices and conventions that we aim to follow at ML6.
+
+
+## Naming conventions
+
+* Always start development with creating a new branch.
+* Name the branch according to our conventions.
+* Use feature/ prefix for a new feature and `bugfix/` for fixing a bug.
+* Separate the words in the branch name with dash.
+
+#### Examples:
+
+* `feature/docs`
+* `bugfix/data-pipeline`
+
+
+## Commit messages
+
+* Write clear commit messages. A commit message should be a short summary of your changes.
+* Use imperative, present tense statements (e.g. 'change', and not 
+'changed' or 'changes').
+* Try to limit the message to about 50 characters or less to keep it clear and readable.
+
+#### Examples:
+
+* `Add io module documentation`
+* `Delete preprocessing step in data pipeline`
+
+
+## Clean commit history
+
+* Only commit the code you tested.
+* Make sure the change is a logical chunk that is completed and has no side effects.
+* Keep separate parts of your change in separate commits. For example, fixing two different bugs 
+should produce two separate commits. This will make your commit history clean and structured. 
+In addition, it would be easier to possibly roll back if something goes wrong, and will also help 
+reviewers to understand the changes faster.
+* Before merging, small commits representing intermediate steps in context of a bigger change or 
+made in response to PR comments can be cleaned up by squashing them.
+
+### Some useful Git commands
+
+#### `git commit`
+
+* `--amend`
+Replaces the last commit done with a new one.
+
+> Use the `--no-edit` flag if you want to keep the commit message.
+
+> Also make sure to to check what your last commit was before amending.
+
+* `--fixup HASH`
+Creates special commit with prefix linked to the specified commit. This commit can be used in 
+combination with `rebase --autosquash` to correct past commits. 
+
+#### `git rebase`
+
+* `--onto`
+Allows the user to specify the starting point of the rebase.
+
+* `-i`
+Interactive rebase - allows the user the select which commits to rebase.
+
+* `--autosquash`
+Can only be used with the interactive rebase. Will automatically squash commits with the prefix 
+`squash!` or `fixup!` with linked list while rebasing.
+
+> Pushing to remote: don’t forget that the above commands changes the commit. This means that to push 
+it to a remote branch you’ll need to use the `--force` flag or `--force-with-lease` flag.
+`--force-with-lease` is a safer option than `--force` as it prevents overwriting the remote if 
+additional commits have been added to the branch.
+
+#### `reset` vs `reverse`
+
+* `git reset HASH` or `git reset HEAD~N`
+Undo local changes by moving pointer back to the specific commit. This means that it changes the 
+commit history and is not recommend to be used for public commits.
+
+`--mixed` (default option) makes it so that only the pointer is moved back. This can be used to 
+squash your latest commits.
+
+`--hard` flag makes it so that the working directory is also updated.
+
+* `git revert HASH` or `git revert HEAD~N`
+Undo changes by adding a new commit that undoes all changes. This means that it does not change the 
+commit history and is the recommended way of correcting public commits.
+
+> Both of these commands can also be executed on a file level.
+
+#### `git rev-list HASH..HEAD`
+
+Lists commit objects in reverse chronological order since commit hash. 
+
+
+## Useful resources
+
+Want some tips on how to fix your Git mistakes and keep your commit history clean? 
+Check [ohshitgit](https://ohshitgit.com).