Added basic instructions for getting started.

INSTALL.md

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+# wolfBoot Setup Instructions
+
+## Gathering Sources
+
+### Git Command Line
+
+```sh
+git clone https://github.com/wolfSSL/wolfBoot.git
+cd wolfBoot
+git submodule init
+git submodule update
+```
+
+### Using browser only
+
+Download these:
+https://github.com/wolfSSL/wolfBoot/archive/master.zip
+https://github.com/wolfSSL/wolfssl/archive/master.zip
+
+1. Extract wolfBoot
+2. `cd wolfBoot/lib`
+3. Extact wolfSSL (should be named `lib/wolfssl`)
+
+Directory should look like:
+
+```
+wolfBoot
+ -> config
+ -> docs
+ -> hal
+ -> IDE
+ -> include
+ -> lib
+   -> wolfssl
+     -> src
+     -> wolfcrypt/src
+ -> src
+ -> test-app
+ -> tools
+```
+
+## Configuration
+
+Use `make config` to walk-through setting up the platform, architecture and partition settings.
+OR
+Use the `config/examples` as a template to wolfBoot root as `.config`. 
+Example: `cp ./config/examples/zynqmp.config .config`
+
+## Setup the Key
+
+Use the key generation tool in `tools/keytool` or get existing keys. 
+Copy `rsa4096.der` to wolfBoot root
+Copy `rsa4096_pub_key.c` to `./src`
+
+## Building
+
+```sh
+make
+```
+
+## Building with Cross Compile
+
+QNX Example:
+
+```sh
+source ~/qnx700/qnxsdp-env.sh
+make CROSS_COMPILE=aarch64-unknown-nto-qnx7.0.0-
+```