Create Git_commit.md

Git_commit.md

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+# IAI Git Commit Message Style Guide
+
+Initially adapted from a [blog post](https://chris.beams.io/posts/git-commit/).
+
+## Commit message objectives 
+
+We want commit messages to be concise and consistent, to communicate the context of a change. 
+
+  * The `diff` contains *what* changes were made, the `commit` explains *why* they were made.
+  * Consistent commit message style 
+      * simplifies both reading and writing commit messages, and
+      * supports communication and collaboration.
+
+## Writing style conventions
+
+  * Write complete and grammatical sentences in English, with regular punctuation, e.g, finishing with a period. 
+  * Use imperative tense, to tersely convey the purpose of the change. 
+      * For example, "Defibrilate the crustacean Jazz mountain, recursively."
+  * Use GitHub flavored markdown syntax where needed. 
+
+## Spacing
+
+  * There should be an empty line before and after headers.
+
+## Markup
+
+  * Top-level lists are marked by `*`, second, third, etc. levels below are marked by `-`. 
+  * Indent items with 2 spaces.
+
+```
+  * List item 1
+  * List item 2
+    - Sub item 21
+      - Sub item 211
+    - Sub item 22
+  * List item 3
+```