Update README.md

README.md

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+<img align="right" src="/man/figures/Becerra_2015.png" alt="ipea" width="300">
+
 # uci: Urban Centrality Index
 
 [![CRAN
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 ```
 
 
-
 ## Basic Usage
 
 ```R
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 ```
 
 
-
-# Citation <img align="right" src="r-package/man/figures/ipea_logo.png" alt="ipea" width="300">
+# Citation <img align="right" src="/man/figures/ipea_logo.png" alt="ipea" width="300">
 
  The R package **uci** is developed by a team at the Institute for Applied 
  Economic Research (Ipea), Brazil. If you use this package in research 
@@ -86,3 +86,6 @@ BibTeX:
   doi = {10.1111/gean.12002}
 }
 ```
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+# Aknowledgement
+The Hex image above illustrates Christaller’s Central Place Theory. It was created by Christaller and adapted by Becerra, 2015.