update progress

Signed-off-by: Alex Chi <iskyzh@gmail.com>

Author: skyzh

README.md

@@ -48,6 +48,42 @@ And we have a compaction simulator to experiment with your compaction algorithm
 cargo run --bin compaction-simulator-ref
 ```
 
+
+## Progress
+
+We are working on chapter 3 and more test cases for all existing contents.
+
+* Week 1: Storage Format + Engine Skeleton
+* Week 2: Compaction and Persistence
+* Week 3: Multi-Version Concurrency Control
+* The Extra Week / Rest of Your Life: Optimizations  (unlikely to be available in 2024...)
+
+✅: finished \
+🚧: WIP and will likely be available soon
+
+| Week + Chapter | Topic                                           | Solution | Starter Code | Writeup |
+| -------------- | ----------------------------------------------- | -------- | ------------ | ------- |
+| 2.7            | Batch Write + Checksum                          | 🚧        |              |         |
+| 3.1            | Timestamp Key Encoding + New Block Format       |          |              |         |
+| 3.2            | Prefix Bloom Filter                             |          |              |         |
+| 3.3            | Snapshot Read                                   |          |              |         |
+| 3.4            | Watermark and Garbage Collection                |          |              |         |
+| 3.5            | Transactions and Optimistic Concurrency Control |          |              |         |
+| 3.6            | Serializable Snapshot Isolation                 |          |              |         |
+| 3.7            | TTL (Time-to-Live) Entries                      |          |              |         |
+| 4.1            | Benchmarking                                    |          |              |         |
+| 4.2            | Block Compression                               |          |              |         |
+| 4.3            | Trivial Move and Parallel Compaction            |          |              |         |
+| 4.4            | Alternative Block Encodings                     |          |              |         |
+| 4.5            | Rate Limiter and I/O Optimizations              |          |              |         |
+| 4.6            | Build Your Own Block Cache                      |          |              |         |
+| 4.7            | Build Your Own SkipList                         |          |              |         |
+| 4.8            | Async Engine                                    |          |              |         |
+| 4.9            | Key-Value Separation                            |          |              |         |
+| 4.10           | Column Families                                 |          |              |         |
+| 4.11           | Sharding                                        |          |              |         |
+| 4.12           | SQL over Mini-LSM                               |          |              |         |
+
 ## License
 
 The Mini-LSM starter code and solution are under Apache 2.0 license. The author reserves the full copyright of the tutorial materials (markdown files and figures).