Create ALTER.md

sqlite/ALTER.md

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+```SQL
+CREATE TABLE test (id INTEGER PRIMARY KEY AUTOINCREMENT, name VARCHAR(20));
+INSERT INTO test (name) VALUES ('fun');
+ALTER TABLE test RENAME TO test_tmp;
+CREATE TABLE test (id INTEGER PRIMARY KEY AUTOINCREMENT, age FLOAT, name VARCHAR(20));
+DROP TABLE test;
+INSERT INTO test (name) SELECT name FROM test_tmp;
+```