Complete README with instructions

README.md

@@ -1,2 +1,37 @@
 # bazel-cpp-boilerplate
+
 Bazel boilerplate with C++ and GoogleTest.
+
+## How to build and run
+
+First, make sure you have [Bazel](https://bazel.build/install) installed.
+
+```bash
+bazel build :all
+```
+
+```bash
+bazel run :hello_main
+```
+
+## Running the tests
+
+```bash
+bazel test --test_output=all :all
+```
+
+## Autocomplete with Neovim
+
+Because we are using Bazel, `clangd` autocomplete in Neovim doesn't know where to find the headers. To fix it, I'm using [Hedron's Compile Commands Extractor for Bazel](https://github.com/hedronvision/bazel-compile-commands-extractor).
+
+Execute the following command to fix autocomplete when new dependencies are installed:
+
+```
+bazel run @hedron_compile_commands//:refresh_all
+```
+
+## Resources
+
+- [Bazel](https://bazel.build/) as the build tool.
+- [Google Test](https://google.github.io/googletest/) for testing.
+- [Bazel Compile Commands Extractor](https://github.com/hedronvision/bazel-compile-commands-extractor) to support autocompletion in Neovim and IDEs.