update README

README.md

+# VAISALA CL31/51 converter to netCDF
+
+## stations
+
+| station        | type | lat      | lon      | alt   |
+| -------------- | ---- | -------- | -------- | ----- |
+| agen           | cl31 | 44.17222 | 0.59472  | 62.0  |
+| orly           | cl31 | 48.71447 | 2.37519  | 89.0  |
+| P7             | cl31 | 48.82775 | 2.380651 | 90.0  |
+| ROISSY 09      | cl31 | 49.0228  | 2.5063   | 119   |
+| ROISSY 27      | cl31 | 49.02537 | 2.56691  | 117.4 |
+| SIRTA Lz1      | cl31 | 48.71811 | 2.20753  | 156   |
+| SIRTA Lz1Lpn   | cl31 | 48.71795 | 2.208764 | 157   |
+| CEREA Lz1      | cl51 | 48.7     | 2.2      | 158   |
+| CEREA Lqualair | cl51 | 48.85    | 2.35     | 38    |
+
+
+## change of configuration for SIRTA CL31
+
+| date       | vert res | temp res | h2  |
+| ---------- | -------- | -------- | --- |
+| 2010-12-13 | 5m       | 3s       | off |
+| 2015-05-21 | 5m       | 3s       | on  |
+| 2016-11-30 | 5m       | 30s      | on  |
+| 2018-09-24 | 10m      | 30s      | on  |
+
+## change of configuration CEREA CL51 installed in sirta
+
+| date       | vert res | temp res | h2      |
+| ---------- | -------- | -------- | ------- |
+| 2017-09-19 | 5m       | 30s      | inconnu |
+| 2018-07-02 | 10m      | 30s      | inconnu |
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