add sql statement syntax

pard-parser/README.md

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+## SQL Parser
+### SQL SYNTAX
+#### PARTITION
+We support three kinds of partitions.
+1. Range partition.
+2. List partition.
+3. Hash partition.
+##### RANGE PARTITION
+```sql
+CREATE TABLE orders_range
+(
+id INT PRIMARY KEY,
+name VARCHAR(30),
+order_date DATE,
+) PARTITION BY RANGE(id)
+(
+p0 VALUES LESS THAN (5),
+p1 VALUES LESS THAN (10),
+p2 VALUES LESS THAN (15),
+p3 VALUES LESS THAN (MAXVALUE)
+);
+```
+##### LIST PARTITION
+```sql
+CREATE TABLE orders_range
+(
+id INT PRIMARY KEY,
+name VARCHAR(30),
+order_date DATE,
+) PARTITION BY LIST(id)
+(
+p0 VALUES IN (1, 2, 3),
+p1 VALUES IN (4, 5),
+p2 VALUES IN (8, 9, 10)
+);
+```
+##### HASH PARTITION
+```sql
+CREATE TABLE orders_range
+(
+id INT PRIMARY KEY,
+name VARCHAR(30),
+order_date DATE,
+) PARTITION BY HASH(id) PARTITIONS 4;
+```