add build markdown

BUILD.md

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+# Build TurboPilot
+
+TurboPilot is a C++ program that uses the [GGML](https://github.com/ggerganov/ggml) project to parse and run language models.
+
+### Dependencies
+
+To build turbopilot you will need CMake, Libboost, a C++ toolchain and GNU Make.
+
+On Ubuntu you can install these things with:
+
+```bash
+sudo apt-get update
+sudo apt-get install libboost-dev cmake build-essential
+```
+
+### Checkout Submodules
+
+Make sure the ggml subproject is checked out with `git submodule init` and `git submodule update`
+
+### Prepare and Build
+
+Configure cmake to build the project with the following:
+
+```bash
+mkdir ggml/build
+cd ggml/build
+cmake -D CMAKE_EXE_LINKER_FLAGS="-static" ..
+```
+
+From here you can now build the components that make up turbopilot:
+
+```bash
+make codegen codegen-quantize codegen-serve
+```
+
+Where:
+
+- *codegen* is a command line tool for testing out prompts in a lightweight way (a lot like llama.cpp)
+- *codegen-serve* is the actual REST server that can be used to connect to VSCode
+- *codegen-quantize* is the tool for quantizing models exported by the conversion script. For more details see [Converting and Quantizing The Models](https://github.com/ravenscroftj/turbopilot/wiki/Converting-and-Quantizing-The-Models).