Add Accuracy, Drain Time, Play Time, Spectate stubs

wiki/Gameplay/Accuracy/en.md

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+# Accuracy
+
+<!-- TODO: needs to be combined with /wiki/Accuracy in some way -->
+
+**Accuracy** defines how accurately a player is hitting [hit objects](/wiki/Hit_Objects) on a [beatmap](/wiki/Beatmaps). This value varies from 0 to 100%. Accuracy can be seen in the top-right corner while watching a replay or playing a beatmap.
+
+<!-- this is a stub -->

wiki/Gameplay/Drain_time/en.md

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+---
+tags:
+  - drain length
+---
+
+# Drain time
+
+**Drain time** refers to the total duration of a [beatmap](/wiki/Beatmaps) that requires the player to be active. Drain time does not include breaks and unmapped portions of a beatmap.
+
+Beatmaps with very long drain times (usually longer than 5 minutes) are typically referred to as marathon maps and require endurance beyond the norm in order to complete successfully.
+
+<!-- this is a stub -->

wiki/Gameplay/Play_time/en.md

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+---
+tags:
+  - length
+  - playtime
+  - total length
+---
+
+# Play time
+
+**Play time** is the total duration of a [beatmap](/wiki/Beatmaps). This includes the lead-in time and the break time(s). This usually correlates with the beatmap's song length.
+
+<!-- this is a stub -->

wiki/Gameplay/Spectate/en.md

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+---
+tags:
+  - spectating
+  - spectator
+---
+
+# Spectate
+
+<!-- TODO: needs to be combined with /wiki/Replay#spectator in some way -->
+
+**Spectating** is when someone watches another player playing a [beatmap](/wiki/Beatmaps) in real time. To spectate, open the extended chat and click on a grey user panel.
+
+For this to work, you will need to have a copy of the exact same beatmap the player you wish to spectate is playing. However, if you have an [osu!supporter](/wiki/osu!supporter) tag, the beatmapset will be downloaded and processed for you through osu!direct.
+
+<!-- this is a stub -->

wiki/Gameplay/en.md

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+# Gameplay
+
+- [Accuracy](/wiki/Gameplay/Accuracy)
+- [Drain Time](/wiki/Gameplay/Drain_Time)
+- [Play Time](/wiki/Gameplay/Play_Time)
+- [Spectate](/wiki/Gameplay/Spectate)
+
+<!-- TODO: category needs some fleshing out and this index probably shouldn't be empty -->