add outlines for week 3

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

mini-lsm-book/src/week3-02-snapshot-read-part-1.md

@@ -12,8 +12,10 @@ assign mvcc object, take write lock, increase ts by 1
 
 ## Task 3: MVCC Compaction
 
-keep all versions
+keep all versions, split file, run merge iterator tests
 
 ## Task 4: LSM Iterator
 
 return the latest version
+
+pass all tests except week 2 day 6

mini-lsm-book/src/week3-03-snapshot-read-part-2.md

@@ -1 +1,15 @@
 # Snapshot Read - Engine Read Path
+
+## Task 1: Store Largest Timestamp in SST
+
+## Task 2: Recover Commit Timestamp
+
+## Task 3: Lsm Iterator with Read Timestamp
+
+## Task 4: Multi-Version Scan and Get
+
+For now, inner = `Fused<LsmIterator>`, do not use `TxnLocalIterator`
+
+explain why store txn inside iterator
+
+do not implement put and delete

mini-lsm-book/src/week3-04-watermark.md

@@ -1 +1,5 @@
 # Watermark and Garbage Collection
+
+## Task 1: Implement Watermark
+
+## Task 2: Garbage Collection in Compaction

mini-lsm-book/src/week3-05-txn-occ.md

@@ -1 +1,7 @@
 # Transaction and Optimistic Concurrency Control
+
+## Task 1: Local Workspace + Put and Delete
+
+## Task 2: Get and Scan
+
+## Task 3: Commit

mini-lsm-book/src/week3-06-serializable.md

@@ -1 +1,5 @@
 # Serializable Snapshot Isolation
+
+## Task 1: Record Read Set and Write Set
+
+## Task 2: Serializable Verification