Update README.md

Add PCMDI logo in the acknowledgement section

README.md

@@ -63,6 +63,12 @@ Acknowledgement
 Content in this repository is developed by climate and computer scientists from the Program for Climate Model Diagnosis and Intercomparison ([PCMDI][PCMDI]) at Lawrence Livermore National Laboratory ([LLNL][LLNL]). This work is sponsored by the Regional and Global Model Analysis ([RGMA][RGMA]) program, of the Earth and Environmental Systems Sciences Division ([EESSD][EESSD]) in the Office of Biological and Environmental Research ([BER][BER]) within the [Department of Energy][DOE]'s [Office of Science][OS]. The work is performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
 
 <p>
+    <img src="https://pcmdi.github.io/assets/PCMDI/100px-PCMDI-Logo-NoText-square-png8.png"
+         width="65"
+         style="margin-right: 30px"
+         title="Program for Climate Model Diagnosis and Intercomparison"
+         alt="Program for Climate Model Diagnosis and Intercomparison"
+    >&nbsp;
     <img src="https://github.com/PCMDI/assets/blob/main/DOE/480px-DOE_Seal_Color.png?raw=true"
          width="65"
          style="margin-right: 30px"