README: Update build instructions

README is currently a bit too sparse, and there is no guidance on how to
use our build system.

Add some initial instructions.

Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/README.md b/README.md
index ca81d649..45ae3a41 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,9 @@
-libcamera: A complex camera support library for Linux, Android, and ChromeOS
+# libcamera: A complex camera support library for Linux, Android, and ChromeOS
+
+To build and install:
+```
+  meson build
+  cd build
+  ninja
+  ninja install
+```