docs: Add some docs on plugins

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.com>

CHANGELOG.md

@@ -76,6 +76,7 @@ plugin](https://github.com/ipfs/go-ipld-eth) that lets ipfs ingest and operate
 on all ethereum blockchain data. Soon to come are plugins for the bitcoin and
 zcash data formats. In the future, we will be adding plugins for other things
 like datastore backends and specialized libp2p network transports.
+You can read more on this topic in [Plugin docs](docs/plugins.md)
 
 In order to simplify its integration with fs-repo-migrations, we've switched
 the ipfs/go-ipfs docker image from a musl base to a glibc base. For most users

docs/experimental-features.md

@@ -282,3 +282,16 @@ Peers can see their (unspecific) relay address in the output of
       dialing.
 - [ ] Dialing priorities for relay addresses; arguably, relay addresses should
       have lower priority than direct dials.
+
+## Plugins
+
+Plugins allow to add functionality without the need to recompile the daemon.
+
+### Basic Usage:
+
+See [Plugin docs](./plugins.md)
+
+### Road to being a real feature
+
+- [ ] Better support for platforms other than Linux
+- [ ] More plugins and plugin types

docs/plugins.md

+# Plugins
+
+Since 0.4.11 go-ipfs has an experimental plugin system for various added
+functionality.
+
+When IPFS node is created, it will load plugins from `$IPFS_PATH/plugins`
+directory (by default `~/.ipfs/plugins`).
+
+### Plugin types
+
+#### IPLD
+IPLD plugins add support for additional formats to `ipfs dag` and other IPLD
+related commands.
+
+### Supported plugins
+
+| Name | Type |
+|------|------|
+|  git | IPLD |
+
+#### Installation
+
+##### Linux
+
+1. Build included plugins:
+```bash
+go-ipfs$ make build_plugins
+go-ipfs$ ls plugin/plugins/*.so
+```
+
+3. Copy desired plugins to `$IPFS_PATH/plugins`
+```bash
+go-ipfs$ mkdir -p ~/.ipfs/plugins/
+go-ipfs$ cp plugin/plugins/git.so ~/.ipfs/plugins/
+go-ipfs$ chmod +x ~/.ipfs/plugins/git.so # ensure plugin is executable
+```
+
+4. Restart daemon if it is running
+
+##### Other
+
+Go currently only supports plugins on Linux, for other platforms you will need
+to compile them into IPFS binary.
+
+1. Uncomment plugin entries in `plugin/loader/preload_list`
+2. Build ipfs
+```bash
+go-ipfs$ make build
+```