Created SQL_RemoveCondition_demo (markdown)

SQL_RemoveCondition_demo.md

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+```java
+final String dbType = JdbcConstants.MYSQL; // ORACLE or POSTGRESQL or SQL_SERVER or HIVE or ODPS
+
+String sql = "select * from t where id = 2 and name = 'wenshao'";
+SQLStatementParser parser = SQLParserUtils.createSQLStatementParser(sql, dbType);
+SQLSelectStatement stmt = (SQLSelectStatement) parser.parseStatement();
+SQLSelectQueryBlock queryBlock = stmt.getSelect().getQueryBlock();
+
+assertTrue(queryBlock.removeCondition("name = 'wenshao'"));
+
+assertEquals("SELECT *\n" +
+        "FROM t\n" +
+        "WHERE id = 2", stmt.toString());
+
+assertTrue(
+        queryBlock.removeCondition("id = 2"));
+
+assertEquals("SELECT *\n" +
+        "FROM t", stmt.toString());
+```