Add Seminal Papers section to references

[apkille]

Here's several papers to start:

• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.88.097904
• https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.82.1784
• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.89.137903
• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.89.137904
• https://journals.aps.org/pra/pdf/10.1103/PhysRevA.37.3028
• https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.89.137903
• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.89.097901
• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.86.3658
• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.91.107901
• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.92.153601
• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.84.4002
• https://journals.aps.org/pra/pdf/10.1103/PhysRevA.71.055801
• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.88.057902

To anyone reading this that wants to add more seminal papers, feel free to share!

[apkille]

I should also mention that there's several important no-go theorems related to Gaussian quantum info that were published in the early to mid 2000s. A separate section could be made for these, or added to the seminal papers section.