added UserGuide.md and filled in endorse story overview and automated…

… tests description (#40)

UserGuide.md

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+### 1. Feature Overview:
+
+Feature Name: Endorse Post
+Purpose: This feature enables TAs and professors to endorse posts, notifying all viewers that the content has been approved or supported by a professor or TA. It offers students a clear and reliable indicator of posts containing verified, legitimate information that they should prioritize reading.
+Coder: Evelynn Chen, Vicky Chen, and Alice Le
+
+### 2. Steps to test feature
+Step 1: Sign into an authorized account (Professor or TA account)
+Step 2: Enter and click into a published post
+Step 3: Click on the Endorse button
+
+
+### 3. Expected Result:
+The endorse button on the post will no longer be available until someone unendorses the post by clicking on unendorse
+ (TA or Professor only)
+Some sort of visual tag will appear on the post showing a TA or Professor has endorsed this post
+
+### Automated Tests
+
+### 1. Test Location
+**Location**: test/posts.js, lines [135-165](https://github.com/CMU-313/nodebb-f24-boba/blob/f24/test/posts.js#L135-L165)
+
+### 2. What is Being Tested
+- **Tested Features**: The API for toggling the endorsed field for a Post.
+- **Test Type**: Unit tests / back-end tests.
+
+### 3. Coverage Justification
+- **Coverage Justification**:
+The tests cover all use cases of toggling the boolean field endorsed. By default, a post is not endorsed, and only one request to endorse/unendorse at a time should be processed.