README.md: add about building and running

1 files changed, 19 insertions, 0 deletions

diff --git a/README.md b/README.md
index 6007928..d5165c5 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,22 @@
 # peach
 
 A weather site.
+
+## building
+
+```bash
+make
+```
+
+## running
+
+```
+peach [ -p PORT ]
+```
+
+If the port is not given, it defaults to `8151`.
+
+### environment variables
+
+- `PEACH_PHOTON_URL`: Photon api url. Set this if geocoding should be
+  enabled.