Add project logos to README and project overview page on docs (#686)

Author: tomvothecoder

README.rst

@@ -252,6 +252,14 @@ Environmental Research (`BER`_) within the `Department of Energy`_'s `Office of
 .. _Department of Energy: https://www.energy.gov/
 .. _Office of Science: https://science.osti.gov/
 
+.. raw:: html
+
+   <p align="center">
+      <img style="display: inline-block; width:200px" src="./docs/_static/e3sm-logo.jpg" alt="E3SM logo"/>
+      <img style="display: inline-block; width:200px" src="./docs/_static/pcmdi-logo.png" alt="PCMDI logo"/>
+      <img style="display: inline-block; width:200px" src="./docs/_static/seats-logo.png" alt="SEATS logo"/>
+   </p>
+
 Contributors
 ------------
 

docs/getting-started-guide/overview.rst

@@ -200,6 +200,14 @@ Environmental Research (`BER`_) within the `Department of Energy`_'s `Office of
 .. _Department of Energy: https://www.energy.gov/
 .. _Office of Science: https://science.osti.gov/
 
+.. raw:: html
+
+   <p align="center">
+      <img style="display: inline-block; width:200px" src="../_static/e3sm-logo.jpg" alt="E3SM logo"/>
+      <img style="display: inline-block; width:200px" src="../_static/pcmdi-logo.png" alt="PCMDI logo"/>
+      <img style="display: inline-block; width:200px" src="../_static/seats-logo.png" alt="SEATS logo"/>
+   </p>
+
 Contributors
 ------------