docs: Add BSD install script

docs/guides/sdk/install.md

@@ -1,7 +1,7 @@
 # Install
 
 The fastest and easiest way to install the Cosmos SDK binaries
-is to run [this script](https://github.com/cosmos/cosmos-sdk/blob/develop/scripts/install.sh) on a fresh Ubuntu instance. Read the comments / instructions carefully (i.e., reset your terminal after running the script).
+is to run [this script](https://github.com/cosmos/cosmos-sdk/blob/develop/scripts/install_sdk_ubuntu.sh) on a fresh Ubuntu instance. Similarly, you can run [this script](https://github.com/cosmos/cosmos-sdk/blob/develop/scripts/install_sdk_bsd.sh) on a fresh FreeBSD instance. Read the comments / instructions carefully (i.e., reset your terminal after running the script).
 
 Cosmos SDK can be installed to
 `$GOPATH/src/github.com/cosmos/cosmos-sdk` like a normal Go program:

scripts/install_sdk_bsd.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/tcsh
+
+# Just run tcsh install_sdk_bsd.sh
+# XXX: this script is intended to be run from
+# a fresh Digital Ocean droplet with FreeBSD
+
+# upon its completion, you must either reset
+# your terminal or run `source ~/.tcshrc`
+
+# change this to a specific release or branch
+set BRANCH=master
+
+sudo pkg updatels
+
+sudo pkg upgrade -y
+sudo pkg install -y gmake
+sudo pkg install -y git
+
+# get and unpack golang
+curl -O https://storage.googleapis.com/golang/go1.10.freebsd-amd64.tar.gz
+tar -xvf go1.10.freebsd-amd64.tar.gz
+
+# move go binary and add to path
+mv go /usr/local
+set path=($path /usr/local/go/bin)
+
+
+# create the go directory, set GOPATH, and put it on PATH
+mkdir go
+echo "setenv GOPATH /root/go" >> ~/.tcshrc
+setenv GOPATH /root/go
+echo "set path=($path $GOPATH/bin)" >> ~/.tcshrc
+
+source ~/.tcshrc
+
+# get the code and move into repo
+set REPO=github.com/cosmos/cosmos-sdk
+go get $REPO
+cd $GOPATH/src/$REPO
+
+# build & install master
+git checkout $BRANCH
+gmake get_tools
+gmake get_vendor_deps
+gmake install
+gmake install_examples