Update README.md with more install instructions

README.md

@@ -2,6 +2,32 @@
 
 To build:
 
-1. Ensure that the CSM is installed in a place that CMake searches (e.g., /usr or /usr/local).
-2. `mkdir build` && `cd build`
-3. `cmake .. && make`
\ No newline at end of file
+1. Install [libcsmapi](https://github.com/sminster/csm "CSM API")
+    > You can install this with an `INSTDIR` of your choice, or let it default (see [libcsmapi README](https://github.com/sminster/csm/blob/master/README))
+```bash
+mkdir $HOME/csmenv
+cd $HOME
+git clone git@github.com:sminster/csm.git
+cd csm
+make -f Makefile.linux64 all install clean INSTDIR="$csmenv"
+```
+2. Install cmake >= 3.10
+```bash
+cd $HOME
+wget https://cmake.org/files/v3.10/cmake-3.10.0-Linux-x86_64.tar.gz
+tar xzf cmake-3.10.0-Linux-x86_64.tar.gz
+rsync -azv cmake-3.10.0-Linux-x86_64/ $HOME/csmenv/
+echo -e "\n#Prepending csm env to path\nsetenv PATH "$HOME/csmenv/bin:$PATH" >> $HOME/.cshrc
+source $HOME/.cshrc
+```
+3. Fork and clone down this repo and its submodules (gtest)
+```bash
+git clone --recursive git@github.com:<username>/CSM-CameraModel.git
+cd CSM-CameraModel
+git remote add upstream git@github.com:USGS-Astrogeology/CSM-CameraModel.git
+git pull upstream master
+git submodule update --init --recursive
+git push -u origin master
+```
+4. `mkdir build` && `cd build`
+5. `cmake -DCSM_INCLUDE_DIR="${csmenv}/include/csm -DCSM_LIBRARY="${csmenv}/lib/libcsmapi.so .. && make`