Added Contribution Guide

Exhaustive Contribution Guide. Removed Trailing Whitespaces.
Updated index.md. Abandoned accidental commits 25474,
25474 and uploading a new patchset. Corrected code renderings.

v2 (jsmoeller): Update contribution subchapters

Bug-AGL: SPEC-3633

Signed-off-by: Shankho Boron Ghosh <shankhoghosh123@gmail.com>
Change-Id: Ia808adc0208052f0591396860ac776e34070d279
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/25473
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>

1 files changed, 56 insertions, 0 deletions

diff --git a/docs/5_How_To_Contribute/5_Reviewing_Changes.md b/docs/5_How_To_Contribute/5_Reviewing_Changes.md
new file mode 100644
index 0000000..14c18bf
--- /dev/null
+++ b/docs/5_How_To_Contribute/5_Reviewing_Changes.md
@@ -0,0 +1,56 @@
+---
+title: Reviewing Changes
+---
+
+1. Click on a link for incoming or outgoing review.
+
+2. The details of the change and its current status are loaded:
+
+      ![review](images/review.png)
+
+      -  **Status:** Displays the current status of the change.
+
+      -  **Reply:** Click on this button after reviewing to add a final review
+         message and a score, -1, 0 or +1.
+
+      -  **Patch Sets:** If multiple revisions of a patch exist, this button
+         enables navigation among revisions to see the changes. By default,
+         the most recent revision is presented.
+
+      -  **Download:** This button brings up another window with multiple
+         options to download or checkout the current changeset. The button on
+         the right copies the line to your clipboard. You can easily paste it
+         into your git interface to work with the patch as you prefer.
+
+         Underneath the commit information, the files that have been changed by
+         this patch are displayed.
+
+3. Click on a filename to review it. Select the code base to
+   differentiate against. The default is ``Base`` and it will generally
+   be what is needed.
+
+4. The review page presents the changes made to the file. At the top of
+   the review, the presentation shows some general navigation options.
+   Navigate through the patch set using the arrows on the top right
+   corner. It is possible to go to the previous or next file in the set
+   or to return to the main change screen. Click on the yellow sticky
+   pad to add comments to the whole file.
+
+      The focus of the page is on the comparison window. The changes made are
+      presented in green on the right versus the base version on the left.
+      Double click to highlight the text within the actual change to provide
+      feedback on a specific section of the code. Press *c* once the code is
+      highlighted to add comments to that section.
+
+5. After adding the comment, it is saved as a *Draft*.
+
+6. Once you have reviewed all files and provided feedback, click the
+   *green up arrow* at the top right to return to the main change page.
+   Click the ``Reply`` button, write some final comments, and submit
+   your score for the patch set. Click ``Post`` to submit the review of
+   each reviewed file, as well as your final comment and score. Gerrit
+   sends an email to the change-submitter and all listed reviewers.
+   Finally, it logs the review for future reference. All individual
+   comments are saved as *Draft* until the ``Post`` button is clicked.
+
+