完成一次Vasp计算工作，需要4个输入文件
INCAR, POSCAR, POTCAR and KPOINTS
1. INCAR contains all keywords and tells VASP what to calculate;
2. POSCAR contains lattice parameters, atomic coordinates information, and atomic velocity
information (for MD);
3. POTCAR is a pseudo potential file, which is USPP or PAW type;
4. KPOINTS, which can be included in INCAR, but not recommended for omitting. It contains Kpoints
information in the reciprocal space at which the wave function integrates to obtain
the charge density.
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其中POTCAR 是Vasp官方提供的赝势文件，不需要自己写，其他三个文件理论上都需要用户输入，其中POSCAR可以通过材料数据库软件生成，KPOINTS对于静态计算也有自动生成的办法，所以麻烦的就是INCAR。
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Vaspkit是一个小工具，用来自动根据计算任务生成对应的INCAR
根据需要选择自己的INCAR
对于POTCAR， 虽然Vasp已经写好了，需要手动拼接导入，这里借助vaspkit完成自动化操作
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