Add contributors.md, update readme.md and yml dependency file

CONTRIBUTORS.md

+The following people contributed to the developpement of this code (chronologic order):
+
++ Alexis Gamelin
++ Ryutaro Nagaoka
++ Watanyu Foosang
++ Naoto Yamamoto
++ David Amorim
++ Antonin Sauret
++ Vadim Gubaidulin
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README.md

@@ -5,6 +5,16 @@ mbtrack2 is a coherent object-oriented framework written in python to work on co
 
 mbtrack2 is composed of different modules allowing to easily write scripts for single bunch or multi-bunch tracking using MPI parallelization in a transparent way. The base of the tracking model of mbtrack2 is inspired by mbtrack, a C multi-bunch tracking code initially developed at SOLEIL.
 
+Examples
+--------
+Jupyter notebooks demonstrating mbtrack2 features are available in the example folder and can be opened online using google colab:
++ mbtrack2 base features [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_demo.ipynb)
++ dealing with RF cavities and longitudinal beam dynamics [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_cavity_resonator.ipynb)
++ collective effects [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_collective_effects.ipynb)
++ bunch by bunch feedback [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_BxB_FB.ipynb)
++ RF loops and feedbacks [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_RF_feedback.ipynb)
+
+
 Installation
 ------------
 
@@ -46,17 +56,14 @@ To test your installation run:
 from mbtrack2 import *
 ```
 
-Examples
---------
-Jupyter notebooks demonstrating mbtrack2 features are available in the example folder and can be opened online using google colab:
-+ mbtrack2 base features [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_demo.ipynb)
-+ dealing with RF cavities and longitudinal beam dynamics [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_cavity_resonator.ipynb)
-+ collective effects [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_collective_effects.ipynb)
-+ bunch by bunch feedback [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_BxB_FB.ipynb)
-+ RF loops and feedbacks [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/GamelinAl/mbtrack2_examples/blob/main/mbtrack2_RF_feedback.ipynb)
-
 References
 ----------
+If used in a publication, please cite mbtrack2 paper and the zenodo archive for the corresponding code version (and any other paper in this list for more specific features).
+
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.10871040.svg)](https://doi.org/10.5281/zenodo.10871040)
+
+### mbtrack2 general features
 A. Gamelin, W. Foosang, and R. Nagaoka, “mbtrack2, a Collective Effect Library in Python”, presented at the 12th Int. Particle Accelerator Conf. (IPAC'21), Campinas, Brazil, May 2021, paper MOPAB070.
 
-Yamamoto, Naoto, Alexis Gamelin, and Ryutaro Nagaoka. "Investigation of Longitudinal Beam Dynamics With Harmonic Cavities by Using the Code Mbtrack." Proc. 10th International Partile Accelerator Conference (IPAC’19), Melbourne, Australia, 19-24 May 2019. 2019.
+### RF cavities with beam loading and RF feedbacks 
+Yamamoto, Naoto, Alexis Gamelin, and Ryutaro Nagaoka. "Investigation of Longitudinal Beam Dynamics With Harmonic Cavities by Using the Code Mbtrack." Proc. 10th International Partile Accelerator Conference (IPAC’19), Melbourne, Australia, 19-24 May 2019. 2019.
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mbtrack2.yml

 name: mbtrack2
 dependencies:
   - python>=3.9
-  - numpy
-  - pandas
-  - scipy
-  - h5py
-  - mpi4py
-  - matplotlib
-  - seaborn
-  - mpmath
+  - numpy>=1.21
+  - pandas>=1.5.3
+  - scipy>=1.7
+  - h5py>=3.6
+  - mpi4py>=3.1
+  - matplotlib>=3.5
+  - seaborn>=0.12
+  - mpmath>=1.21
   - pip
   - pip: 
     - accelerator-toolbox
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