Created API (markdown)

API.md

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+## URL ##
+
+All API endpoints are based off of `/api`. As in, if you access Lidarr via `http://localhost:8686`, the API root would be `http://localhost:8686/api`. You can also take the example `http://192.168.1.20:8686/lidarr/api`. 
+
+All other items build after this.
+
+## Authentication ##
+
+All requests made to the API endpoint require the API Key authentication using the `X-Api-Key` header or using the ```?apikey=``` query string:
+
+```
+http://localhost:8686/api/system/status?apikey=${YOUR_API_KEY}
+```
+
+Where:
+
+1. `http://localhost:8686/api` is the main API Endpoint
+2. `/system/status` would be the specific GET request, which can be submitted by the other commands.
+3. `?apikey=${YOUR_API_KEY}` is required for requests against your Lidarr instance, and gets stuck here at the end.
+4. There are other commands that request/require additional information, of which will be explained on those pages.
+
+### API Key ###
+
+- Can be accessed and reset via `Settings -> General` through the GUI 
+- Also can be accessed via the `Config.xml` file, in the AppData Directory
+- alpha-numeric (lower case)
+
+## Dates & Times ##
+
+- All dates/timestamps are `ISO-8601` formatted in UTC `2014-01-27T01:30:00Z`
+- Episodes (and episode based endpoints, missing & calendar) also include the airdate in the original timezone for display purposes
+- Date parameters should be `ISO-8601 UTC` dates to ensure proper handling by Lidarr
+
+## Content Type ##
+
+- All `POST/PUT` requests require all parameters to be JSON encoded in the body, unless otherwise noted.
+- All `GET` requests will return a JSON encoded response
+
+## Endpoints ##
+
+- [[Calendar]]
+- [[Command]]
+- [[Diskspace]]
+- [[Track]]
+- [[TrackFile]]
+- [[History]]
+- [[Images]]
+- [[Wanted Missing]]
+- [[Queue]]
+- [[Profile]]
+- [[Release]]
+- [[Release/Push|Release-Push]]
+- [[Rootfolder]]
+- [[Artist]]
+- [[Artist-Lookup]]
+- [[System-Status]]