add the leveldb XXXlib.a to the master

Signed-off-by: spark.huang <240401736@qq.com>
add the leveldb/libleveldb.a and leveldb/libmemenv.a to the repository

Signed-off-by: spark.huang <240401736@qq.com>
add the linux_shell/libleveldb.a and linux_shell/libmemenv.a to repository

Signed-off-by: spark.huang <240401736@qq.com>
add some ignore file to the .gitignore

Signed-off-by: spark.huang <240401736@qq.com>