Touch up the building documentation to be more accessible to new devs -

closes Vector35#490

build.md

@@ -1,33 +1,48 @@
 # Building
 
-- Download LLDB development build for your OS at https://github.com/Vector35/lldb-artifacts/releases. 
+- Update to the latest development build of Binary Ninja 
+  - Follow [this](https://docs.binary.ninja/guide/index.html#support) guide to do so
+
+- Clone `binaryninja-api` and checkout to the corresponding commit used to build the version of Binary Ninja you are running
+  - If you updated to the latest dev build of Binary Ninja, then you can checkout the api repo to the latest dev as well
+  - A more robust approach is to find the file `api_REVISION.txt` in `BN_INSTALLATION_FOLDER/Resources`
+
+```bash
+git clone https://github.com/Vector35/binaryninja-api.git
+cd binaryninja-api
+git checkout dev
+# or git checkout commit_hash
+```
+
+- Download LLDB development build for your OS at https://github.com/Vector35/lldb-artifacts/releases - make sure that the correct LLDB version is downloaded (`grep 'LLVM_VERSION ' core/CMakeLists.txt` can help)
   - Extract the zip archive to `~/libclang`
 
 - Download Qt development build for your OS at https://github.com/Vector35/qt-artifacts/releases.
   - Extract the zip archive to `~/Qt`
 
 - Build the debugger
 
-```
+```bash
 # Get the source
-git clone https://github.com/Vector35/binaryninja-api.git
 git clone https://github.com/Vector35/debugger.git
 
 # Do an out-of-source build
-mkdir build
+mkdir -p build
 cd build
 
 # Build it
-cmake -DBN_API_PATH=../binaryninja-api 
-      -DBN_INSTALL_DIR=/path/to/binaryninja/installation
+cmake -DBN_API_PATH=../binaryninja-api -DBN_INSTALL_DIR=/path/to/binaryninja/installation ..
 
 make
 ```
 
-The build artifacts will be in the folder `out`.
+While the code is compiling, it's a good time to check the [Binary Ninja slack](https://slack.binary.ninja) for any updates!
+
+The build artifacts will be in the folder `out`. You should find two files `libdebuggercore` and `libdebuggerui`, and two folders `python` and `lldb`. 
 
 - Run the debugger
-  - Open Binary Ninja, disable the setting `corePlugins.debugger` so the debugger that comes with Binary Ninja is not loaded 
-  - Copy everything in the `out` folder to the user plugin folder
+  - Open Binary Ninja, disable the setting `corePlugins.debugger` so the debugger that comes with Binary Ninja is not loaded
+  - Close Binary Ninja
+  - Copy everything in the `out` folder to the user plugin folder - `cp -r out/plugins/* ~/.binaryninja/plugins/`
   - Set the environment variable `BN_STANDALONE_DEBUGGER=1`
   - Launch BinaryNinja