Add documentation for tracking PRs assigned for review through the Zulip chat

Author: apiraino

Diff for: src/SUMMARY.md

@@ -14,6 +14,7 @@
     - [Agenda Generator](./triagebot/agenda.md)
     - [Issue Assignment](./triagebot/issue-assignment.md)
     - [PR Assignment](./triagebot/pr-assignment.md)
+    - [Tracking PR assignment](./triagebot/pr-assignment-tracking.md)
     - [Autolabels](./triagebot/autolabels.md)
     - [Close](./triagebot/close.md)
     - [Documentation Updates](./triagebot/doc-updates.md)

Diff for: src/triagebot/pr-assignment-tracking.md

@@ -0,0 +1,24 @@
+# Tracking PR assignment
+
+If you contribute in some capacity to the Rust compiler development, you might also be assigned pull requests to be reviewed.
+
+You can check your current review assignment in two ways:
+- by visiting this [GitHub URL](https://github.com/pulls/assigned)
+- by interacting with the `@triagebot` on the [Zulip chat](/platforms/zulip.md) in a DM (Direct Messages) thread. You can open a direct message session clicking on [this link](https://rust-lang.zulipchat.com/#narrow/dm/261224-triagebot) (requires Zulip login).
+
+This chapter will describe how to interact with the bot on Zulip.
+
+## Configuration
+
+Tracking the PR assignment is enabled on the git repository by having a `[pr-tracking]` table in `triagebot.toml`. No additional configuration is needed.
+
+## Usage
+
+Open a Direct Message sessioj with the `triagebot` and use one of these commands:
+
+* `work` --- Will emit an error and show the available commands
+* `work show` --- Will show your Github username and a list of pull requests assigned to you for review (on the `rust-lang/rust` git repository)
+
+## Implementation
+
+See [`parser/src/handlers/pr_tracking.rs`](https://github.com/rust-lang/triagebot/blob/HEAD/parser/handlers/pr_tracking.rs).

Diff for: src/triagebot/pr-assignment.md

@@ -3,6 +3,8 @@
 Triagebot handles automatic and manual assignment of GitHub PRs.
 It also handles welcoming new users when they post a PR.
 
+Rust contributors can track and manage their own work queue using the Zulipchat integration. See [Tracking PR assignment](/triagebot/pr-assignment-tracking.md).
+
 ## Usage
 
 Automatic assignment of new PRs is handled by the configuration in the `triagebot.toml`, described [below](#configuration).