Merge pull request #83 from zdaq12/condense_init

add troubleshooting for missing Fortran compiler

Author: slayoo

README.md

@@ -97,6 +97,16 @@ error: [Errno 2] No such file or directory: 'cmake'
 ```
 Try rerunning after installing CMake (e.g., `apt-get install cmake` or `brew install cmake`)
 
+```
+No CMAKE_Fortran_COMPILER could be found.
+```
+Try installing a Fortran compiler (e.g., `brew reinstall gcc`)
+
+```
+warning: no files found matching 'gitmodules/...
+```
+Since git clone was done without recursive option, try: `git submodule update --init`
+
 #### How to debug
 ```sh
 git clone --recursive git+https://github.com/open-atmos/PyPartMC.git