Update 00_intro.rst

Added the CRAN and R terms to glossary

Author: bashirk

src/misc/00_intro.rst

@@ -21,12 +21,16 @@ Glossary
   ICU
     **I**\ nternational **C**\ omponents for **U**\ nicode. ICU is an open-source project of mature C/C++ and Java libraries for Unicode support, software internationalization, and software globalization. `Learn More <http://site.icu-project.org/>`_. 
 
-    
+  R
+    **R** is a free software environment for statistical computing and graphics. It compiles and runs on a wide variety of UNIX platforms, Windows and MacOS. `Learn More <https://r-project.org/>`_.
+
+  CRAN
+    **C**\ omprehensive **R** **A**\ rchive **N**\ etwork. CRAN is a network of FTP and web servers around the world that store identical, up-to-date, versions of code and documentation for :term:`R`. `Learn More <https://cran.r-project.org/>`_.
 
 
 TODO list
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 .. todolist::
 
-The original entry is located in ``.src`` file of `/home/runner/work/conda-forge.github.io/conda-forge.github.io/src/maintainer/knowledge_base.rst, line 952. <https://github.com/conda-forge/conda-forge.github.io/blob/master/src/maintainer/knowledge_base.rst#noarch-generic/>`_.
+The original entry is located in ``.src`` file of `/home/runner/work/conda-forge.github.io/conda-forge.github.io/src/maintainer/knowledge_base.rst, line 952. <https://github.com/conda-forge/conda-forge.github.io/blob/master/src/maintainer/knowledge_base.rst#noarch-generic/>`_.