Fix, placeholder image, api

Added a placeholder image, code style
Fixed metadata missing issue
More work on api

Code-Style.md

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+# Code style guide
+
+## Go
+
+- Use `gofmt`
+- `jsonapi` fields must use dasharised names
+  (eg `some-field` instead of `some_field` or `someField`)
+- Function, struct and variable names must describe their purpose adequatly.
+  Making them longer for that purpose is fine
+- Follow [https://go.dev/doc/effective_go]
+  (which also happens to be convenient place to start learning Go)
+- Always use zerolog for console output. In http handlers,
+  use `hlog.FromRequest` to get a logger instance prepared with a bunch of metadata
+- As Linstrom is both intended for active use as well as providing a learning resource,
+  all functions and structs must be documented
+
+## JS/TS
+
+<!-- TODO: Fill this out -->
+
+- Biome should do most of the work