Add help document for TA grading.

TAs.md

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+### Grading
+
+All grading happens on [the grading server](https://stat-301-instructor.stat.ubc.ca). If 
+you visit that URL in your browser, you will be taken to a login page.
+
+You can log into your individual account using your username and password. You can do whatever 
+you want in this account; this is your "sandbox." It's often useful to clone our 
+
+You can *also* log into a *grading account* (usually something like `worksheet-grader-0`)
+using the *grading account's username* and *your usual password*.
+DSCIBot will email you when you are given a grading task to work on.
+
+### How to login to grading server
+1. Access the instructor server at stat-301-instructor.stat.ubc.ca
+2. The grader login is not your regular login it is composed of two parts: 
+stat301 + name of assignment + your grading account username
+For example, my login is gaby, then to grade tutorial_01 I’ll enter as my login:
+   stat301tutorial_01gaby
+3.  After sucessfully logging in your page should look like this
+  ![image (35)](https://media.github.ubc.ca/user/2712/files/51cf5667-36a2-432b-acf9-e0e3bffde6d0)
+4. Select "Nbgrader" from the top and click on "Formgrader"
+
+![image (37)](https://media.github.ubc.ca/user/2712/files/f82e667e-1c63-4785-9715-12c0291b393c)
+
+5.  Then, click on “Manual Grade”
+![image (38)](https://media.github.ubc.ca/user/2712/files/82e4d3db-aa93-43d5-b4fd-1de836f08042)
+
+6. Then, find the assignment you want to grade. First assignment is “Tutorial intro”
+![image](https://media.github.ubc.ca/user/2712/files/c79c1433-010c-4f71-af45-5bef9f46c903)
+
+7. Then, click on tutorial intro once again
+![image](https://media.github.ubc.ca/user/2712/files/6ce5982e-bd3e-4321-b172-0b645f6085f1)
+
+8. Then you’ll see a list of submissions, just click on one to start grading. 
+![image](https://media.github.ubc.ca/user/2712/files/b0cc5961-eba8-4bd1-9a7d-62318fd0245b)
+
+9. Navigate to the question you need to grade, and put the grade on the blue box
+![image](https://media.github.ubc.ca/user/2712/files/1e536623-6dc7-449b-982c-8ba2254bb880)
+(Note, you’ll see and be able to change the grades in autograded questions as well. Please DO 
+NOT CHANGE those grades). 
+
+That's it!
+
+### Important note about grading
+
+There is no "submit" button when you finish grading.
+The grading system considers your job to be "done" when
+you complete grading all students.
+
+**So if you are not ready yet (still want to look things over,
+discuss with another TA, etc) make
+sure not to grade all of your students. Leave at least one ungraded.**
+
+When you are finally ready to be "finished," you can grade
+all of the students and the system will automatically continue
+the grading/return/feedback process.
+
+### Useful Grading Shortcuts
+
+| Key combination | Functionality |
+| ------------ | ------------- |
+| `tab` | Move to the next score or comment input |
+| `shift-tab` | Move to the previous score or comment input |
+| `escape` | Defocus and save the current score or comment input |
+| `enter` | Refocus the most recent score or comment input |
+| `control-.` | **Move to the same score or comment input of the next submission** |
+| `control-shift-.` | Move to the same score or comment input of the next submission with failed tests |
+| `control-,` | **Move to the same score or comment input of the previous submission** |
+| `control-shift-,` | Move to the same score or comment input of the previous submission with failed tests |
+| `control-shift-f` | Flag the submission |
+
+Bolded functions are especially useful.
+
+These can be found by clicking the grey question mark at the bottom right of the screen with a submission open in formgrader.